- 08 Jun, 2020 8 commits
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Georg Neis authored
Object materialization did not correctly deal with a mismatch between current representation of a field value and expected representation. This is an attempt to repair the situation. Bug: chromium:1084820 Change-Id: Ib337cbaf5e36a5a616b6a6cb0ddf51018d49b96a Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2228330 Commit-Queue: Georg Neis <neis@chromium.org> Reviewed-by:
Tobias Tebbi <tebbi@chromium.org> Reviewed-by:
Nico Hartmann <nicohartmann@chromium.org> Cr-Commit-Position: refs/heads/master@{#68231}
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Thibaud Michaud authored
R=sigurds@chromium.org Bug: v8:10533 Change-Id: I81756299c286801423fd0f5170046235c8e3dede Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2235117Reviewed-by:
Georg Neis <neis@chromium.org> Commit-Queue: Thibaud Michaud <thibaudm@chromium.org> Cr-Commit-Position: refs/heads/master@{#68230}
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Leszek Swirski authored
This reverts commit 8748613f. Reason for revert: MSAN failures (https://ci.chromium.org/p/v8/builders/ci/V8%20Linux%20-%20arm64%20-%20sim%20-%20MSAN/32760?) Original change's description: > [compiler] Hook in binary op builtins with feedback in generic lowering > > If --turbo-nci is enabled, use binary op builtins with feedback > collection during generic lowering. > > Bug: v8:8888 > Change-Id: I307dc742488982bdc68006be5bcd1da8e68768f5 > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2228614 > Commit-Queue: Jakob Gruber <jgruber@chromium.org> > Reviewed-by: Georg Neis <neis@chromium.org> > Cr-Commit-Position: refs/heads/master@{#68227} TBR=neis@chromium.org,jgruber@chromium.org Change-Id: I635b1a5a28b25ce29e4f8bc23eb52841885b0cdf No-Presubmit: true No-Tree-Checks: true No-Try: true Bug: v8:8888 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2235535Reviewed-by:
Leszek Swirski <leszeks@chromium.org> Commit-Queue: Leszek Swirski <leszeks@chromium.org> Cr-Commit-Position: refs/heads/master@{#68229}
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Milad Farazmand authored
Port df2ab0f0 R=zhiguo.zhou@intel.com, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com BUG= LOG=N Change-Id: I1f0026d4240fcd0a9ad5f84daf01bd7e3df4234e Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2233235Reviewed-by:
Junliang Yan <jyan@ca.ibm.com> Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com> Cr-Commit-Position: refs/heads/master@{#68228}
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Jakob Gruber authored
If --turbo-nci is enabled, use binary op builtins with feedback collection during generic lowering. Bug: v8:8888 Change-Id: I307dc742488982bdc68006be5bcd1da8e68768f5 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2228614 Commit-Queue: Jakob Gruber <jgruber@chromium.org> Reviewed-by:
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Dominik Inführ authored
Move expansion of the new space into the safepoint. Otherwise background threads race with the main thread when accessing the new space capacity. This will most likely also be required to allow the allocation of new space objects from background threads. Bug: v8:10315 Change-Id: Ia8ac0c9f582876b655eaf4e35082aeadfbdb830e Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2235532Reviewed-by:
Ulan Degenbaev <ulan@chromium.org> Commit-Queue: Dominik Inführ <dinfuehr@chromium.org> Cr-Commit-Position: refs/heads/master@{#68226}
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Michael Lippautz authored
Document: - TraceCallback - TraceDescriptor - TraceTrait Bug: chromium:1056170 Change-Id: I1c57ce215e4f6f83563326924cfc4c6aeef33e41 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2235112 Commit-Queue: Michael Lippautz <mlippautz@chromium.org> Reviewed-by:
Omer Katz <omerkatz@chromium.org> Cr-Commit-Position: refs/heads/master@{#68225}
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Zhao Jiazhong authored
Port df2ab0f0 https://crrev.com/c/2219688 Change-Id: I5183d883a8bc34723efadde4782301f205273bb6 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2233436Reviewed-by:
Clemens Backes <clemensb@chromium.org> Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn> Cr-Commit-Position: refs/heads/master@{#68224}
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- 07 Jun, 2020 1 commit
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v8-ci-autoroll-builder authored
Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/8bce03b..036a45e Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/cf2d770..a85d58e TBR=machenbach@chromium.org,tmrts@chromium.org,v8-waterfall-sheriff@grotations.appspotmail.com Change-Id: Iffb627b481a869f2d7b4d5e45529c3f94aa40f08 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2234461Reviewed-by:
v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com> Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com> Cr-Commit-Position: refs/heads/master@{#68223}
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- 06 Jun, 2020 4 commits
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Benedikt Meurer authored
This aligns the wasm locals with how JavaScript locals are displayed in the DevTools scope view. Before: https://i.imgur.com/y0urpbL.png After: https://i.imgur.com/368KDay.png Bug: chromium:1043034 Change-Id: I5811d18101ec68c320fd223e041e12989c66e721 Doc: https://bit.ly/wasm-fallback-dx#bookmark=id.1uhy72x83he7 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2232550 Commit-Queue: Zhi An Ng <zhin@chromium.org> Reviewed-by:
Zhi An Ng <zhin@chromium.org> Auto-Submit: Benedikt Meurer <bmeurer@chromium.org> Cr-Commit-Position: refs/heads/master@{#68222}
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v8-ci-autoroll-builder authored
Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/3142ebd..8bce03b Rolling v8/third_party/aemu-linux-x64: ij0nEFLmrqJqEp81i5YIDjeQ8epXhPrtAI0otT1OId0C..WCiGqc2IsqMVCcj8UruU8vGLvhfosP46CB3tAy6N2boC Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/92c6c3e..69b4144 Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/02dbd01..cf2d770 Rolling v8/third_party/googletest/src: https://chromium.googlesource.com/external/github.com/google/googletest/+log/cb44c86..4fe0180 Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/fab9ca5..3c04a1b TBR=machenbach@chromium.org,tmrts@chromium.org,v8-waterfall-sheriff@grotations.appspotmail.com Change-Id: If1eeb990b78e5503daafc760e1dfe23b8b112e15 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2234022Reviewed-by:
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Zhou, Zhiguo authored
Bug: v8:9909 Change-Id: I99c599ac1d872a8b4e7c154a942026b52ecb0bd5 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2219688 Commit-Queue: Zhiguo Zhou <zhiguo.zhou@intel.com> Reviewed-by:
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Milad Farazmand authored
Port 2f7f90b5 Original Commit Message: This reverts commit dfbbb4a5. Reason for revert: Bitmask added post 84 cut, so it is not part of origin trial. Therefore it is still a post-mvp. Original change's description: > [wasm-simd] Add bitmask to SIMD MVP > > This removes the post-mvp flag for bitmask, since it was accepted into > the proposal, see https://github.com/WebAssembly/simd/pull/201. > > Bug: v8:10308 > Change-Id: I4ced43a6484660125d773bc9de46bdea9f72b13b > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2216532 > Reviewed-by: Deepti Gandluri <gdeepti@chromium.org> > Commit-Queue: Zhi An Ng <zhin@chromium.org> > Cr-Commit-Position: refs/heads/master@{#67993} R=zhin@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com BUG= LOG=N Change-Id: I2076f24c2e232ca071b9dc62c9f23d3eb7acfa72 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2233406Reviewed-by:
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- 05 Jun, 2020 27 commits
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Manos Koukoutos authored
Bug: v8:7748 Change-Id: I461b68f1950847271a92e7b52f3d4d8b520eccfe Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2231349 Commit-Queue: Manos Koukoutos <manoskouk@chromium.org> Reviewed-by:
Andreas Haas <ahaas@chromium.org> Reviewed-by:
Jakob Kummerow <jkummerow@chromium.org> Cr-Commit-Position: refs/heads/master@{#68218}
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Bill Budge authored
- Uses fast path technique to speed up F64x2Min/Max on x64. Bug: v8:8639 Change-Id: I766752ba9c515bbeb94709460429a71d9f34fd2e Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2232940 Commit-Queue: Bill Budge <bbudge@chromium.org> Reviewed-by:
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Ng Zhi An authored
This reverts commit dfbbb4a5. Reason for revert: Bitmask added post 84 cut, so it is not part of origin trial. Therefore it is still a post-mvp. Original change's description: > [wasm-simd] Add bitmask to SIMD MVP > > This removes the post-mvp flag for bitmask, since it was accepted into > the proposal, see https://github.com/WebAssembly/simd/pull/201. > > Bug: v8:10308 > Change-Id: I4ced43a6484660125d773bc9de46bdea9f72b13b > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2216532 > Reviewed-by: Deepti Gandluri <gdeepti@chromium.org> > Commit-Queue: Zhi An Ng <zhin@chromium.org> > Cr-Commit-Position: refs/heads/master@{#67993} TBR=gdeepti@chromium.org,zhin@chromium.org # Not skipping CQ checks because original CL landed > 1 day ago. Bug: v8:10308 Change-Id: I53294be4ea816f37c7cc5f545afb572538dd4770 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2233183Reviewed-by:
Deepti Gandluri <gdeepti@chromium.org> Commit-Queue: Zhi An Ng <zhin@chromium.org> Cr-Commit-Position: refs/heads/master@{#68216}
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Manos Koukoutos authored
This change is needed to implement {struct,array}.get_{s,u}. Some functionality in wasm-compiler was factored out to helper functions LoadWithAlignment and StoreWithValueType. Bug: v8:7748 Change-Id: I2a04d09d40532f2389cc82b4c9ee3d8e003c5101 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2231347Reviewed-by: -
Milad Farazmand authored
Change-Id: I346d237515c589c65e2c073eea55cdbfc301688e Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2233179Reviewed-by:
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Clemens Backes authored
If multiple workers are sharing the same module, the DevTools frontend will set the same breakpoints in all of them, but one after another. This CL tries to avoid repeated recompilation of that function in most cases. Only if we need special source positions for stack rewriting, we need to compile a special version. R=thibaudm@chromium.org Bug: v8:10359 Change-Id: I06114d6feb2030b75dcbde91c62b822f1807ad6e Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_rel Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_isolates_rel_ng Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2231339 Commit-Queue: Clemens Backes <clemensb@chromium.org> Reviewed-by:
Thibaud Michaud <thibaudm@chromium.org> Cr-Commit-Position: refs/heads/master@{#68213}
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Clemens Backes authored
When the last debugger is disabled, we tier up the module to TurboFan. Doing this in the background creates problems with profiling, where the debugger is disabled before starting to profile, in order to guarantee profiling of top-tier code. Hence this CL changes the logic such that we only return from the {TierUpAllModulesPerIsolate} methods once tier up is complete. Since the DevTools frontend disables all debuggers before starting a profile, this will ensure that all new calls execute TurboFan code. Because of this change, the {TriggerRecompilation} method is renamed to {RecompileForTiering}. The test cases stay unchanged (do a busy wait until tier up is done), because in the multi-isolates tests it is not guaranteed that tier up is complete after disabling a single debugger. R=thibaudm@chromium.org Bug: v8:10580 Change-Id: I75c4b97825f856f562cfa656c11293d3b964898b Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_rel Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_isolates_rel_ng Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2232539 Commit-Queue: Clemens Backes <clemensb@chromium.org> Reviewed-by: -
Dan Elphick authored
This reverts commit 81c34968 and also 490f3580 which depends on the former. Reason for revert: Break CFI tests in chromium https://ci.chromium.org/p/chromium/builders/ci/Linux%20CFI/17438 Original change's description: > [heap] Make ReadOnlySpace use bump pointer allocation > > This changes ReadOnlySpace to no longer be a PagedSpace but instead it > is now a BaseSpace. BasicSpace is a new base class that Space inherits > from and which has no allocation methods and does not dictate how the > pages should be held. > > ReadOnlySpace unlike Space holds its pages as a > std::vector<ReadOnlyPage>, where ReadOnlyPage directly subclasses > BasicMemoryChunk, meaning they do not have prev_ and next_ pointers and > cannot be held in a heap::List. This is desirable since with pointer > compression we would like to remap these pages to different memory > addresses which would be impossible with a heap::List. > > Since ReadOnlySpace no longer uses most of the code from the other > Spaces it makes sense to simplify its memory allocation to use a simple > bump pointer and always allocate a new page whenever an allocation > exceeds the remaining space on the final page. > > Change-Id: Iee6d9f96cfb174b4026ee671ee4f897909b38418 > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2209060 > Commit-Queue: Dan Elphick <delphick@chromium.org> > Reviewed-by: Ulan Degenbaev <ulan@chromium.org> > Cr-Commit-Position: refs/heads/master@{#68137} TBR=ulan@chromium.org,delphick@chromium.org # Not skipping CQ checks because original CL landed > 1 day ago. Change-Id: I68c9834872e55eb833be081f8ff99b786bfa9894 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2232552 Commit-Queue: Dan Elphick <delphick@chromium.org> Reviewed-by:
Dan Elphick <delphick@chromium.org> Reviewed-by:
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Camillo Bruni authored
- remove redundant checks - use switch over PromiseHookType Change-Id: I89a5328009634a7025feb77e22334773c2886868 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2224225Reviewed-by:
Sathya Gunasekaran <gsathya@chromium.org> Reviewed-by:
Simon Zünd <szuend@chromium.org> Commit-Queue: Camillo Bruni <cbruni@chromium.org> Cr-Commit-Position: refs/heads/master@{#68210}
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Bill Budge authored
- Use a shorter code sequence for the most likely case (no NaNs or signed 0 errors), and use out-of-line code to handle those cases. - For the likely execution paths, F32x4Min goes from 8 to 6 instructions, while F32x4Max goes from 9 to 6 instructions. - Code size increases by 2 and 3 instructions (the test and branch, and for max, an extra move. Bug: v8:8639 Change-Id: I7966f652c89545e840ae493f25dd652b1e079b91 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2231653Reviewed-by:
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Camillo Bruni authored
- Show map description for selected maps - More instructions for detailed investigation Change-Id: Ia07e847c20cafc52160310c7a358004330d22094 No-Presubmit: true No-Tree-Checks: true No-Try: true Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2231356Reviewed-by:
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Gus Caplan authored
This will allow Node.js to properly track async context in thenables. Change-Id: If441423789a78307a57ad7e645daabf551cddb57 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2215624Reviewed-by:
Camillo Bruni <cbruni@chromium.org> Reviewed-by:
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Michael Lippautz authored
Free memory is marked as inaccessible, which means that it contains a zap value and is poisoned in ASAN builds. Before writing the unlinked sentinel, we must unpoison the memory area in ASAN builds. Bug: chromium:1056170 Change-Id: Ib253913cce7d62e1000d4b581bdeb13a1e19cc67 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2232541 Commit-Queue: Michael Lippautz <mlippautz@chromium.org> Reviewed-by:
Anton Bikineev <bikineev@chromium.org> Auto-Submit: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/master@{#68206}
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Michael Lippautz authored
The observers can use ResetAllocatedObjectSize() to e.g. implement a growing strategy that resets its limit on this call. Bug: chromium:1056170 Change-Id: Ib9553e00cc530ff89f44e4258c13d47f0b70568e Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2228885Reviewed-by:
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Clemens Backes authored
The wasm interpreter was always single-threaded, and there are no plans to change this. Still, there was a concept of threads, but with the hard-coded constraint that there is always exactly one of them. In order to clean up the code, and as a preparation to remove more unneeded functionality before moving the interpreter over to the test directory, this CL removes the concept of threads and merges the {ThreadImpl} class into {WasmInterpreterInternals}. Drive-by: Remove the dead {GetFrameCount} method. R=ahaas@chromium.org Bug: v8:10389 Change-Id: If65cdd21b34ce8debf8ba0f24dbeacec15e0a1d7 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2231354Reviewed-by: -
Tamer Tas authored
This CL fixes the UnboundLocalError in unittests testsuite. R=machenbach@chromium.org Bug: chromium:1091200 Change-Id: I9a4e032915b2750c28e3eb9f97042b75ca547801 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2232540 Commit-Queue: Tamer Tas <tmrts@chromium.org> Commit-Queue: Michael Achenbach <machenbach@chromium.org> Auto-Submit: Tamer Tas <tmrts@chromium.org> Reviewed-by:
Michael Achenbach <machenbach@chromium.org> Cr-Commit-Position: refs/heads/master@{#68203}
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Andreas Haas authored
R=v8-arm-ports@googlegroups.com, clemensb@chromium.org Bug: v8:10108 Change-Id: I22dce431b8aadf25072288ecd38daa2cde029919 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2231351 Commit-Queue: Andreas Haas <ahaas@chromium.org> Reviewed-by:
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Michael Lippautz authored
Bug: chromium:1056170 Change-Id: I1e168f967acf0e4d6094106c0693e1a10f409f49 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2231357 Auto-Submit: Michael Lippautz <mlippautz@chromium.org> Commit-Queue: Omer Katz <omerkatz@chromium.org> Reviewed-by:
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Clemens Backes authored
Most interface calls are preceded by a reachability check, such that we only generate code if the current instruction is actually reachable. This is particularly important for Liftoff (TurboFan would throw out dead parts of the graph anyway). In order to speed up this check, this CL introduces a boolean flag directly on the {WasmFullDecoder}. This avoids checking whether an error has been set *plus* checking the reachability of the top-most control block. This provides 5-6% speedup on Liftoff compilation locally. R=thibaudm@chromium.org Bug: v8:10576 Change-Id: Idcff623fb9c23473b06ebf91b3caee65cc6ca28b Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2230521Reviewed-by: -
Dominik Inführ authored
Prevent deadlock on shutdown by allowing all allocations on background threads after tear down was started. Background threads need the main thread to perform the collection, which never happens when V8 is already shutting down. Bug: v8:10315 Change-Id: I5d3358229624aead7b0ebcfee7e5840315f23329 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2230537 Commit-Queue: Dominik Inführ <dinfuehr@chromium.org> Reviewed-by:
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Arnaud Robin authored
Added display of identation, function index, function names and compiler used when tracing function calls in wasm. R=clemensb@chromium.org Bug: v8:10559 Change-Id: I58b4e7b077365bdee7bae9b5ad8a50178c322147 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2230532 Commit-Queue: Arnaud Robin <arobin@google.com> Reviewed-by:
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Igor Sheludko authored
1) make it possible to combine tracing logic with accounting allocator supporting zone compression, 2) make it possible to record zone memory usage via Chrome tracing machinery (especially, for already running process), 3) trace both allocated and actually used memory per zone, Bug: v8:10572 Change-Id: I768e474ada1a384218af09efd0dfce2d9a43ac3c Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2228888 Commit-Queue: Igor Sheludko <ishell@chromium.org> Reviewed-by:
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Manos Koukoutos authored
Changes: - Unpack packed typed in arrays/structs where needed. - i8 should have log-size 0. - Use typed-funcref feature flag instead of gc where appropriate. - Set argument indexes correctly for gc opcodes in function-body-decoder. - Remove no-longer valid TODOs. Bug: v8:7748 Change-Id: I1a73794d0f93da6c7177e496d47df4106031f0eb Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2230520 Commit-Queue: Manos Koukoutos <manoskouk@chromium.org> Reviewed-by:
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Igor Sheludko authored
Change-Id: I31e16fcfd6641d88b3b6d3195dc30464833d0821 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2231345 Commit-Queue: Igor Sheludko <ishell@chromium.org> Reviewed-by:
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Andreas Haas authored
R=v8-arm-ports@googlegroups.com, clemensb@chromium.org Bug: v8:10108 Change-Id: I7564caaf0d6c1591270b59e275869f335c83ad74 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2230533 Commit-Queue: Andreas Haas <ahaas@chromium.org> Reviewed-by:
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Dominik Inführ authored
Add method to make LABs in all local heaps iterable and invoke this function in Heap::MakeHeapIterable(). Bug: v8:10315 Change-Id: I6c8b1ea2337647f68995c13e6244d5ef0673b0e6 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2230534Reviewed-by:
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Manos Koukoutos authored
Changes: - Remove subtyping checks from value-type.h and move them to dedicated files. Leave a limited version in value-type.h for testing. - Implement subtyping for struct and array types, according to the wasm-gc proposal. - Implement type equivalence checking. - Introduce a subtyping relation cache in WasmModule. - Rename IsSubTypeOf -> IsSubtypeOf. - Fix v8 possible bug where iterator_range took two unused type parameters. - Add unittests for subtyping. Bug: v8:7748 Change-Id: I0ddbda4145e0412196dcf4fc63f3c5875fb3ab5a Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2228497 Commit-Queue: Manos Koukoutos <manoskouk@chromium.org> Reviewed-by:
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