A continuation of the work in 59e4b751, this extracts logic around
memory reservation and allocations out of the Deserializer class.

Follow-up work is planned to create a specialized allocator for
builtin deserialization.

Bug: v8:6624
Change-Id: I7081cdc557ab8fb2571aadb816399e136ea2cdbb
Reviewed-on: https://chromium-review.googlesource.com/716036
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48634}

R=bmeurer@chromium.org
BUG=v8:6792

Change-Id: I8ed3e6ec06bfba117781efc63d79bc7641b7ec24
Reviewed-on: https://chromium-review.googlesource.com/722641Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48633}

R=rossberg@chromium.org

Bug: 
Change-Id: Icac33dc87dd660173e5a45d02b31be46f7d1cb2d
Reviewed-on: https://chromium-review.googlesource.com/721550
Commit-Queue: Ben Titzer <titzer@chromium.org>
Reviewed-by: Andreas Rossberg <rossberg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48632}

OSR for functions which use arguments no longer needs to be disabled, since
TurboFan handles the case.

Bug: 
Change-Id: I121f1190a142c18f113bd5f875e258812645c43f
Reviewed-on: https://chromium-review.googlesource.com/721661Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48631}

Bug: chromium:774860
Change-Id: I180ca7e9e8d8603e0d61deb0eb71d758895d0f74
Reviewed-on: https://chromium-review.googlesource.com/721551Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48630}

BUG=v8:5402,v8:6921

Change-Id: Iab2509554718a6beca73217f80cafedf650bd066
Reviewed-on: https://chromium-review.googlesource.com/718741Reviewed-by: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48629}

This reverts commit 972d460f.

Reason for revert: This CL is not the right solution, and it makes back-merging the right solution more difficult.

Original change's description:
> [wasm] Use 64-bit comparison for bounds checks on 64-bit platforms
> 
> By using 64-bit comparison we make sure that there will be no out of
> memory accesses even if there are stale values in the high word of a
> register.
> 
> R=​titzer@chromium.org
> 
> Change-Id: I2627b15e1598f35cc480d7028031e8de405164ea
> Reviewed-on: https://chromium-review.googlesource.com/721323
> Reviewed-by: Ben Titzer <titzer@chromium.org>
> Commit-Queue: Andreas Haas <ahaas@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48604}

TBR=titzer@chromium.org,ahaas@chromium.org

Change-Id: I0c15e9d8ac72def2e22543a17366126d90a17918
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/721702Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48628}

The simulator currently does not handle signalling NaNs correctly on
the vabs and vneg instructions.
Temporarily disable the tests until we have a fix.

R=ahaas@chromium.org

Bug: v8:6947
Change-Id: I281cb8213cdcc73c91768a82c44f90f009f7c8eb
Reviewed-on: https://chromium-review.googlesource.com/721663Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48627}

Disabling only for stress mode did not help, the test uses 10GB
in other modes too.

Bug: v8:6924
Change-Id: I0e1348f8a43e41612d3a94e75396f0a26a82ece2
Reviewed-on: https://chromium-review.googlesource.com/721662Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48626}

Remove unused macros, and move macro definitions used only in a single
file into the file itself.

Cq-Include-Trybots: master.tryserver.v8:v8_linux_noi18n_rel_ng
Change-Id: If62107816ad1e6addf58705a075d3eba4f23bf08
Reviewed-on: https://chromium-review.googlesource.com/721381Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48625}

This adds a single bottleneck that properly handles the copying of empty, COW
and FixedDoubleArray arrays under the control of flags. This is in preparation
of adding new CSA-based array builtins on Array.prototype.

Drive by: Fix SmiConstant handling when ENABLE_VERIFY_CSA is not active and 
make the use of constant detection/folding consistent in the CSA depending
on ParameterMode.

Change-Id: If1889ab8cbff1805286b7b4344c29ffbe7191b39
Reviewed-on: https://chromium-review.googlesource.com/715798
Commit-Queue: Daniel Clifford <danno@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48624}

This code is never used, and we don't right trim TypedArrays.

Bug: 
Change-Id: Ic3e32b194fb10ecd067449c755b1982c87c98257
Reviewed-on: https://chromium-review.googlesource.com/721541Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48623}

This reverts commit 2857e783.

Reason for revert:
https://build.chromium.org/p/client.v8/builders/V8%20Linux/builds/20965

Original change's description:
> [ia32][wasm] Add I32x4AddHoriz and I16x8AddHoriz
> 
> Add phaddd, phaddw and AVX version
> Add vmovdqu and Movdqu macro
> 
> Bug: 
> Change-Id: I4f5c0cf96ab481fc18f0a0d554101a996a16c954
> Reviewed-on: https://chromium-review.googlesource.com/715677
> Commit-Queue: Jing Bao <jing.bao@intel.com>
> Reviewed-by: Bill Budge <bbudge@chromium.org>
> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48621}

TBR=bbudge@chromium.org,mtrofin@chromium.org,bmeurer@chromium.org,jing.bao@intel.com

Change-Id: Icaf36b46134e77e46180fc1671d0c6569b729a89
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/722679Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48622}

Add phaddd, phaddw and AVX version
Add vmovdqu and Movdqu macro

Bug: 
Change-Id: I4f5c0cf96ab481fc18f0a0d554101a996a16c954
Reviewed-on: https://chromium-review.googlesource.com/715677
Commit-Queue: Jing Bao <jing.bao@intel.com>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48621}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/0db5732..b6fbb0d

Rolling v8/buildtools: https://chromium.googlesource.com/chromium/buildtools/+log/f6d165d..e043d81

Rolling v8/third_party/android_tools: https://chromium.googlesource.com/android_tools/+log/ca9dc72..110e5f6

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/c0f385b..733ecb1

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/d1283a8..af65d54

TBR=machenbach@chromium.org,hablich@chromium.org

Change-Id: Iac5e37f0f49ddf33182e1742e97e81ad1c5e1b52
Reviewed-on: https://chromium-review.googlesource.com/721505Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48620}

Inner functions which called eval, and were the kind of functions
that can use `super`, were erroneously not marked as "uses_super_property",
leading to downstream crashes when the runtime tried to load the
[[HomeObject]] from them.

This patch eliminates the public Scope::uses_super_property()
API and ensures that callers always call Scope::NeedsHomeObject()
instead.

This is a minimal fix designed for easy merging; it's likely that
in the long run we should remove most mentions of "uses super property"
and replace them with "needs home object" for clarity.

Bug: v8:5516, chromium:774994
Change-Id: Id269dd33e35bd40f6b59a3d3e19330687afa64f8
Reviewed-on: https://chromium-review.googlesource.com/721879Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48619}

The method returns names for all available top-level scope variables
in giving context.

R=dgozman@chromium.org,jgruber@chromium.org

Bug: chromium:681333
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I2d0b600e1afbfef9087f53ea9c26abe1e112047c
Reviewed-on: https://chromium-review.googlesource.com/719409
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48618}

R=dgozman@chromium.org

Bug: chromium:696798
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ida60ee5fb3e3e42d15bf6d4bad84dfcfb521b74f
Reviewed-on: https://chromium-review.googlesource.com/722073Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48617}

Change-Id: I77b6eb5e949f8b37fa76d2a161d1ec2c1117ab04
Reviewed-on: https://chromium-review.googlesource.com/722078Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Ben Smith <binji@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48616}

This is a reland of 61292f0b
Original change's description:
> [inspector] breakpoint after last break position should not jump to first line
> 
> R=jgruber@chromium.org
> 
> Bug: chromium:730177
> Change-Id: I0f3666a333604cb80bb51410c5edf2aceb0c6ef5
> Reviewed-on: https://chromium-review.googlesource.com/717717
> Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48556}

TBR=jgruber@chromium.org

Bug: chromium:730177
Change-Id: I564cc5d7778f9d79780eae9dbe2d9aafaad4f466
Reviewed-on: https://chromium-review.googlesource.com/721468
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48615}

This reverts commit d0e3fb4f.

Reason for revert: Failures on all GPU bots:
https://build.chromium.org/p/client.v8.fyi/builders/Win%20Release%20%28NVIDIA%29/builds/3171
https://build.chromium.org/p/client.v8.fyi/builders/Linux%20Release%20%28NVIDIA%29/builds/3730

Original change's description:
> Reland: [heap] Add missing steps for Add/Remove observers
> 
> This is a reland of https://chromium-review.googlesource.com/c/v8/v8/+/715118.
> The UI doesn't allow me to reland this automatically due to merge conflicts
> so I ended up doing this manually.
> 
> Change-Id: Ic013b61f459cb1e91e24203fb31ae7c14f3754f8
> Reviewed-on: https://chromium-review.googlesource.com/720136
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Commit-Queue: Ali Ijaz Sheikh <ofrobots@google.com>
> Cr-Commit-Position: refs/heads/master@{#48606}

TBR=ulan@chromium.org,mlippautz@chromium.org,ofrobots@google.com

Change-Id: I80f63ac0cc54471b3ecaa7b6d85b1805ea599dd4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/721440Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48614}

Because the typeof operator may lower to a builtin call (which is
effectful in turbofan parlance after effect control linearization),
it really should be encoded as a simplified operator, which can
be optimized with respect for the effect chain in linearization.

No new functionality here, rather a furniture rearrangement in
the TurboFan node structure.

BUG=v8:6929

Change-Id: I38593e10956ebd57cecdd606c35f3f73efb1327e
Reviewed-on: https://chromium-review.googlesource.com/718745Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48613}

This supports {valueOf() { return BigInt(...) }} objects as
operands in binary and unary operations.

Bug: v8:6791
Change-Id: I30ec9983ff611477742f9ea0bc6d04972fe21d3c
Reviewed-on: https://chromium-review.googlesource.com/716863
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48612}

We can use member initializers instead of the OTHER_CONSTANTS macro to
handle the declaration of oddball AstValue members in AstValueFactory.

Bug: v8:6921
Change-Id: I701e2fd36f854cfc0d835981d060622070b5bfba
Reviewed-on: https://chromium-review.googlesource.com/719395Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48611}

This is a reland of af49af00
Original change's description:
> PPC/s390: Fix arguement handling
> 
> 1. in AssembleMove and AssembleSwap, we need to distinguish Double and Float
> 2. in 32-bit mode, double needs to be counted as 2 slots in stack
> 
> R=joransiu@ca.ibm.com, jbarboza@ca.ibm.com, michael_dawson@ca.ibm.com, mmallick@ca.ibm.com
> 
> Bug: 
> Change-Id: Iffe1844aa72e9d4c9492034c3df9a994e1304a27
> Reviewed-on: https://chromium-review.googlesource.com/720676
> Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
> Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
> Cr-Commit-Position: refs/heads/master@{#48593}

Change-Id: If91125e71b82c92f54f537345e4c213bd185e786
Reviewed-on: https://chromium-review.googlesource.com/721419Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#48610}

This is only enabled when --experimental-wasm-threads is enabled.

In addition, only shared WebAssembly.Memory may be sent, as specified
here: https://github.com/WebAssembly/design/pull/1074/files#diff-8e85308ab5cc1e83e91ef59233648be2R227

Bug: v8:6895
Change-Id: Id009a7f890d15fa6c98e93f03806f7e7eff30c2a
Reviewed-on: https://chromium-review.googlesource.com/719417
Commit-Queue: Brad Nelson <bradnelson@chromium.org>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Reviewed-by: Brad Nelson <bradnelson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48609}

Port the baseline version of Reflect.has to the CodeStubAssembler and
reuse the existing logic for HasProperty (i.e. the HasProperty builtin).
Also inline the Reflect.has builtin into TurboFan, by adding a check
on the target in front of a use of the JSHasProperty operator.
Technically this additional check is not necessary, because the
JSHasProperty operator already throws if the target is not a JSReceiver,
but the exception message is confusing then.

This improves the performance of the micro-benchmark from

  reflectHasPresent: 337 ms.
  reflectHasAbsent: 472 ms.

to

  reflectHasPresent: 121 ms.
  reflectHasAbsent: 216 ms.

which is a nice 2.8x improvement in the best case. It also improves the
chai test on the web-tooling-benchmark by around 1-2%, which is roughly
the expected win (since Reflect.has overall accounts for around 3-4%).

Bug: v8:5996, v8:6936, v8:6937
Change-Id: I856183229677a71c19936f06f2a4fc7a794a9a4a
Reviewed-on: https://chromium-review.googlesource.com/720959
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48608}

Calls like read_leb<int32_t, true, true, true>(...) can be hard to read
and understand. This CL replaces the three boolean template parameters
with enums so that the call is read_leb<int32_t, kChecked, kAdvancePC, kTrace>(...)
now.

R=clemensh@chromium.org

Bug: v8:6921
Change-Id: Id876a727d5e17df721444e7e5a117ad5395071aa
Reviewed-on: https://chromium-review.googlesource.com/718204
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48607}

This is a reland of https://chromium-review.googlesource.com/c/v8/v8/+/715118.
The UI doesn't allow me to reland this automatically due to merge conflicts
so I ended up doing this manually.

Change-Id: Ic013b61f459cb1e91e24203fb31ae7c14f3754f8
Reviewed-on: https://chromium-review.googlesource.com/720136Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Ali Ijaz Sheikh <ofrobots@google.com>
Cr-Commit-Position: refs/heads/master@{#48606}

This is a reland of 56da97bb
Original change's description:
> [snapshot] Ship lazy TFJ builtins
> 
> Design doc: goo.gl/dxkYDZ
> 
> Bug: v8:6624
> Change-Id: I8813f79e415843ffe8d33a605a2662dbfc0c9764
> Reviewed-on: https://chromium-review.googlesource.com/674883
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Reviewed-by: Michael Hablich <hablich@chromium.org>
> Commit-Queue: Jakob Gruber <jgruber@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48590}

TBR=yangguo@chromium.org,hablich@chromium.org

Bug: v8:6624, v8:6942
Change-Id: I1af6b0982f7e129127f2714c27a74b7e39207065
Reviewed-on: https://chromium-review.googlesource.com/721179
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48605}

By using 64-bit comparison we make sure that there will be no out of
memory accesses even if there are stale values in the high word of a
register.

R=titzer@chromium.org

Change-Id: I2627b15e1598f35cc480d7028031e8de405164ea
Reviewed-on: https://chromium-review.googlesource.com/721323Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48604}

Pause sweeper tasks when entering the Scavenger. In future CLs this
enables removing the page lock for the Scavenger.

CQ_INCLUDE_TRYBOTS=master.tryserver.v8:v8_linux64_tsan_rel;master.tryserver.v8:v8_linux64_tsan_concurrent_marking_rel_ng;master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel

Bug: v8:6923, chromium:774108
Change-Id: Idcb7e14b94704dead70c33a49e67047b88bb6c4c
Reviewed-on: https://chromium-review.googlesource.com/718200
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48603}

Instead of modifying this flag in compiled wasm code, we can just
change it in the caller / called code. This saves code space and
compilation time and fixes the referenced bug.

R=titzer@chromium.org, eholk@chromium.org

Bug: chromium:773631, v8:5277
Change-Id: I095158ac01eecd21a92649a3990e8d7c593db912
Reviewed-on: https://chromium-review.googlesource.com/712597Reviewed-by: Ben Titzer <titzer@chromium.org>
Reviewed-by: Eric Holk <eholk@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48602}

R=joransiu@ca.ibm.com, jbarboza@ca.ibm.com, michael_dawson@ca.ibm.com

Bug: 
Change-Id: I30c5bba9380d71d1ea2fc0391aa90adca9330eb2
Reviewed-on: https://chromium-review.googlesource.com/721339Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#48601}

This reverts commit af49af00.

Reason for revert: <INSERT REASONING HERE>

There is a mistake in codegen to cause error in snapshot.

Original change's description:
> PPC/s390: Fix arguement handling
> 
> 1. in AssembleMove and AssembleSwap, we need to distinguish Double and Float
> 2. in 32-bit mode, double needs to be counted as 2 slots in stack
> 
> R=​joransiu@ca.ibm.com, jbarboza@ca.ibm.com, michael_dawson@ca.ibm.com, mmallick@ca.ibm.com
> 
> Bug: 
> Change-Id: Iffe1844aa72e9d4c9492034c3df9a994e1304a27
> Reviewed-on: https://chromium-review.googlesource.com/720676
> Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
> Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
> Cr-Commit-Position: refs/heads/master@{#48593}

TBR=michael_dawson@ca.ibm.com,jyan@ca.ibm.com,joransiu@ca.ibm.com,jbarboza@ca.ibm.com,mmallick@ca.ibm.com

Change-Id: I76b7eb96e7bfc15e3d2b07474543e996b9ea5f86
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/721140Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#48600}

R=bmeurer@chromium.org, jarin@chromium.org

Bug: v8:6941
Change-Id: Ic1062e1c5f181ab5041fb7b7cb1487683a36c300
Reviewed-on: https://chromium-review.googlesource.com/721020
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48599}

Bug: v8:6917
Change-Id: Ife79f1d3c60f591c00bb1ecd340a9f1b31b02039
Reviewed-on: https://chromium-review.googlesource.com/720808Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michał Majewski <majeski@google.com>
Cr-Commit-Position: refs/heads/master@{#48598}

NOTRY=true
TBR=titzer@chromium.org

Bug: chromium:775027
Change-Id: I0bd4a55e3530e1e2f26bbe416587f1421f6cdbae
Reviewed-on: https://chromium-review.googlesource.com/721180Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48597}

Use the (D)CHECK_{EQ,NE,GT,...} macros instead of (D)CHECK with an
embedded comparison. This gives better error messages and also does the
right comparison for signed/unsigned mismatches.

This will allow us to reenable the readability/check cpplint check.

R=marja@chromium.org

Bug: v8:6837, v8:6921
Change-Id: I17cf5cbbac3d2992c3b3588cc66e8564982453b6
Reviewed-on: https://chromium-review.googlesource.com/681355Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48596}

- Extract core StringPrototypeRepeat code into a TFS builtin (StringRepeat)
  - Assumes arguments are a string and smi (no range checks)
- Add StringPrototypePadStart and StringPrototypePadEnd TFJ builtins
  - Added StringPadAssembler to ensure common behavior
- Removed functionality from string.js

A quick benchmark shows significant performance gains for unoptimized
code (2.1x to 2.46x) and optimized code (1.03x - 1.56x).

https: //github.com/peterwmwong/v8-perf/blob/master/string-pad/README.md
Bug: v8:5049
Change-Id: I6e4fe99fb62a3edb3d6906fd4f78b3576b5b0d13
Reviewed-on: https://chromium-review.googlesource.com/720067
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48595}