* New atomic code stubs for x64, ia32, arm, arm64
* Add convenience functions JumpIfNotValidSmiValue, JumpIfUintNotValidSmiValue
  to macro-assembler-ia32 (API based on x64 macro assembler)
* Remove runtime implementation of Atomics.load, the code stub should always be
  called instead
* Add new test to mjsunit atomics test; check that Smi values of different
  sizes are supported when possible, else fall back to HeapNumbers

These changes were needed to add another codestub:
* Bump kStubMajorKeyBits from 7 to 8
* Reduce ScriptContextFieldStub::kSlotIndexBits from 13 to 12

BUG=v8:4614
LOG=y

Review URL: https://codereview.chromium.org/1617503003

Cr-Commit-Position: refs/heads/master@{#35427}

port 52148c41

Original Commit Message:
    Add relocatable pointers for wasm memory references that need to be updated when wasm GrowMemory is used. Code generator changes to accept relocatable constants as immediates.

R=gdeepti@google.com, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com, mbrandy@us.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1884573003

Cr-Commit-Position: refs/heads/master@{#35426}

BUG=

Review URL: https://codereview.chromium.org/1883533006

Cr-Commit-Position: refs/heads/master@{#35425}

Port eb5fe0df

Original commit message:
    Add relocatable pointers for wasm memory references that need to
    be updated when wasm GrowMemory is used. Code generator changes to
    accept relocatable constants as immediates.

R=gdeepti@google.com, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1878233002

Cr-Commit-Position: refs/heads/master@{#35424}

The usage of __attribute__((format(x, y)) was either wrong or missing from multiple functions, leading to erroneous formats. This CL:

 - Imports PRINTF_FORMAT macro from Chrome's src/base/compiler-specific.h.
 - Uses it appropriately.
 - Imports Chrome's base/format_macros.h mainly to fix size_t formats (further cleanup could be done).
 - Fixes a bunch of incorrect formats.

Original CL: https://codereview.chromium.org/1869433004
Reverted in: https://codereview.chromium.org/1867383002
Reverted again in: https://codereview.chromium.org/1877823003

Reverts due to non-CQ bots:
  - First: v8_win_dbg, v8_win64_dbg, v8_mac_dbg
  - Second: gc mole (added to v8_linux_rel_ng for this patch)

R= jochen@chromium.org
TBR= ahaas@chromium.org,bmeurer@chromium.org,yangguo@chromium.org

Review URL: https://codereview.chromium.org/1872203005

Cr-Commit-Position: refs/heads/master@{#35423}

Port 79ff6507

R=verwaest@chromium.org, joransiu@ca.ibm.com, mbrandy@us.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1877353002

Cr-Commit-Position: refs/heads/master@{#35422}

When %OptimizeOSR is used with ignition flag, the runtime function tries to
compile for OSR on interpreted functions. This cl modifies
Runtime_OptimizeOsr function to return false for interpreted frames.

BUG=v8:4280,chromium:599002
LOG=N

Review URL: https://codereview.chromium.org/1880073002

Cr-Commit-Position: refs/heads/master@{#35421}

Fix for drotr and drotr32 instructions in MIPS64 simulator.

BUG=

Review URL: https://codereview.chromium.org/1880953002

Cr-Commit-Position: refs/heads/master@{#35420}

This uses the common predicate SharedFunctionInfo::IsApiFunction to
determine flushability. Just a minor cleanup, no change in semantics.

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/1878183002

Cr-Commit-Position: refs/heads/master@{#35419}

Previously TurboFan always went to the runtime to allocate in old space,
which is pretty slow compare to a stub call.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1877323002

Cr-Commit-Position: refs/heads/master@{#35418}

port 2e329666

Original Commit Message:
    ... instead of doing stack magic.  This is a cleanup in preparation for the new
    generators implementation.

R=bmeurer@chromium.org, neis@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com, bjaideep@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1882553003

Cr-Commit-Position: refs/heads/master@{#35417}

Port 2e329666

Original commit message:
    ... instead of doing stack magic.  This is a cleanup in preparation for the new
    generators implementation.

R=neis@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1874323002

Cr-Commit-Position: refs/heads/master@{#35416}

Makes browser_tests --gtest_filter=CrSettingsBrowserTest.CrSettingsTest
complete in a little over 8 seconds instead of timing out after 45s
on my box.  Without this patch, the test is much slower in gn builds
than in gyp builds.

v8/ part, goes with https://codereview.chromium.org/1880693003

BUG=chromium:586511
LOG=n

Review URL: https://codereview.chromium.org/1882453002

Cr-Commit-Position: refs/heads/master@{#35415}

R=ulan@chromium.org
BUG=chromium:581412
LOG=N

Review URL: https://codereview.chromium.org/1882033002

Cr-Commit-Position: refs/heads/master@{#35414}

This ensures that GC tracer scope is nested in a trace event.

BUG=

Review URL: https://codereview.chromium.org/1881993002

Cr-Commit-Position: refs/heads/master@{#35413}

When the embedder sets the heap tracer, V8, during marking, will collect all reachable wrappers, and then ask embedder to trace its heap. The embedder is expected to call PersistentBase::RegisterExternalReference with all wrappers reachable from the given ones. This fixed point iteration happens in MarkCompact::ProcessEphemeralMarking.

For more efficient object visiting during marking, we need a special JS_API_OBJECT_TYPE (in tandem with already existing JS_SPECIAL_API_OBJECT_TYPE) and corresponding visitor (JSApiObjectVisitor).

BUG=chromium:468240
LOG=no

Review URL: https://codereview.chromium.org/1844413002

Cr-Commit-Position: refs/heads/master@{#35412}

Make these builtins fast by default w/o relying on the
%_StringCharCodeAt and %_StringCharAt intrinsics, which we cannot deal
with well in TurboFan (and ignition).

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux_nosnap_dbg,v8_linux_blink_rel
R=epertoso@chromium.org

Committed: https://crrev.com/43d3331d87f68ea7efa1b58f559f33f60e5dacfb
Cr-Commit-Position: refs/heads/master@{#35350}

Committed: https://crrev.com/253a16f690ab593a95249c34ded9df477ad9a54c
Cr-Commit-Position: refs/heads/master@{#35402}

Review URL: https://codereview.chromium.org/1868963002

Cr-Commit-Position: refs/heads/master@{#35411}

Revert of [builtins] Migrate String.prototype.charCodeAt and String.prototype.charAt to TurboFan. (patchset #3 id:40001 of https://codereview.chromium.org/1868963002/ )

Reason for revert:
Please rebaseline:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/5992

Original issue's description:
> [builtins] Migrate String.prototype.charCodeAt and String.prototype.charAt to TurboFan.
>
> Make these builtins fast by default w/o relying on the
> %_StringCharCodeAt and %_StringCharAt intrinsics, which we cannot deal
> with well in TurboFan (and ignition).
>
> CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux_nosnap_dbg
> R=epertoso@chromium.org
>
> Committed: https://crrev.com/43d3331d87f68ea7efa1b58f559f33f60e5dacfb
> Cr-Commit-Position: refs/heads/master@{#35350}
>
> Committed: https://crrev.com/253a16f690ab593a95249c34ded9df477ad9a54c
> Cr-Commit-Position: refs/heads/master@{#35402}

TBR=epertoso@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1877263002

Cr-Commit-Position: refs/heads/master@{#35410}

This is a convenience API that an embedder can use to do final checks on
the return value. Note that this creates a new handle and thus defeats
the performance optimization done for ReturnValue - an embedder should
only use this in non-performance critical code paths.

BUG=
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/1875263003

Cr-Commit-Position: refs/heads/master@{#35409}

BUG=535160
TBR=sergiyb@chromium.org, kjellander@chromium.org
NOTRY=true
NOPRESUBMIT=true

Review URL: https://codereview.chromium.org/1884473002

Cr-Commit-Position: refs/heads/master@{#35408}

Add relocatable pointers for wasm memory references that need to be updated when wasm GrowMemory is used. Code generator changes to accept relocatable constants as immediates.

R=titzer@chromium.org, yangguo@chromium.org, bradnelson@chromium.org

Committed: https://crrev.com/eb5fe0df64ec0add423b2a1f6fb62d5a33dce2a5
Cr-Commit-Position: refs/heads/master@{#35182}

Committed: https://crrev.com/297932a302ce0b73c3618ef9e4eba9d9d241f2b3
Cr-Commit-Position: refs/heads/master@{#35400}

Review URL: https://codereview.chromium.org/1759383003

Cr-Commit-Position: refs/heads/master@{#35407}

Fixes updating golden files following instanceof change.

BUG=v8:4280
LOG=N
R=rmcilroy@chromium.org,ssanfilippo@chromium.org

Review URL: https://codereview.chromium.org/1858593002

Cr-Commit-Position: refs/heads/master@{#35406}

Port 79ff6507

R=verwaest@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1874983004

Cr-Commit-Position: refs/heads/master@{#35405}

Revert of Visit the Optimized Code Map on first call rather than closure creation. (patchset #7 id:120001 of https://codereview.chromium.org/1670143002/ )

Reason for revert:
Blocks roll. See https://codereview.chromium.org/1877003002/ for detailed messages.

You should be able to repro this with Linux ASAN.

Original issue's description:
> Visit the Optimized Code Map on first call rather than closure creation.
>
> This is useful for escape analysis, and helps upcoming changes to
> type feedback gathering.
>
> BUG=
>
> Committed: https://crrev.com/9336f4cc6d25d39a128176679a70dbd13a6d946e
> Cr-Commit-Position: refs/heads/master@{#35395}

TBR=mstarzinger@chromium.org,bmeurer@chromium.org,mvstanton@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/1878063004

Cr-Commit-Position: refs/heads/master@{#35404}

The parameter is not used at the moment, so I removed it.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1876833003

Cr-Commit-Position: refs/heads/master@{#35403}

Make these builtins fast by default w/o relying on the
%_StringCharCodeAt and %_StringCharAt intrinsics, which we cannot deal
with well in TurboFan (and ignition).

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux_nosnap_dbg
R=epertoso@chromium.org

Committed: https://crrev.com/43d3331d87f68ea7efa1b58f559f33f60e5dacfb
Cr-Commit-Position: refs/heads/master@{#35350}

Review URL: https://codereview.chromium.org/1868963002

Cr-Commit-Position: refs/heads/master@{#35402}

Revert of [compiler] Add relocatable pointer constants for wasm memory references. (patchset #15 id:320001 of https://codereview.chromium.org/1759383003/ )

Reason for revert:
[Sheriff] Breaks msan:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20arm64%20-%20sim%20-%20MSAN/builds/7842

Original issue's description:
> [compiler] Add relocatable pointer constants for wasm memory references.
>
> Add relocatable pointers for wasm memory references that need to be updated when wasm GrowMemory is used. Code generator changes to accept relocatable constants as immediates.
>
> R=titzer@chromium.org, yangguo@chromium.org, bradnelson@chromium.org
>
> Committed: https://crrev.com/eb5fe0df64ec0add423b2a1f6fb62d5a33dce2a5
> Cr-Commit-Position: refs/heads/master@{#35182}
>
> Committed: https://crrev.com/297932a302ce0b73c3618ef9e4eba9d9d241f2b3
> Cr-Commit-Position: refs/heads/master@{#35400}

TBR=bradnelson@chromium.org,titzer@chromium.org,bmeurer@chromium.org,bradnelson@google.com,gdeepti@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1881913002

Cr-Commit-Position: refs/heads/master@{#35401}

Add relocatable pointers for wasm memory references that need to be updated when wasm GrowMemory is used. Code generator changes to accept relocatable constants as immediates.

R=titzer@chromium.org, yangguo@chromium.org, bradnelson@chromium.org

Committed: https://crrev.com/eb5fe0df64ec0add423b2a1f6fb62d5a33dce2a5
Cr-Commit-Position: refs/heads/master@{#35182}

Review URL: https://codereview.chromium.org/1759383003

Cr-Commit-Position: refs/heads/master@{#35400}

Review URL: https://codereview.chromium.org/1856643002

Cr-Commit-Position: refs/heads/master@{#35399}

Reland of [compiler] Make feedback vector cope with flag changes. (patchset #1 id:1 of https://codereview.chromium.org/1876103002/ )

Reason for revert:
Did not fail on another roll including this CL ..

Original issue's description:
> Revert of [compiler] Make feedback vector cope with flag changes. (patchset #1 id:1 of https://codereview.chromium.org/1869693003/ )
>
> Reason for revert:
> Blocks current roll: https://codereview.chromium.org/1876713002/ according to bisect: https://codereview.chromium.org/1872353002/#ps80001
>
> Original issue's description:
> > [compiler] Make feedback vector cope with flag changes.
> >
> > This fixes corner cases where the layout of feedback vectors baked into
> > the snapshot is different from the expected layout, depending on some
> > runtime flags. We make sure the feedback vector is regenereated for
> > functions that are not compiled. Flag changes of this kind are only
> > allowed when code is not serialized.
> >
> > An alternative solution would be to not serialize the feedback vector
> > for such cases in the first place. That solution however would have a
> > higher overhead, as it would required the serializer to be able to
> > recognize feedback vectors while generating a snapshot.
> >
> > R=mvstanton@chromium.org
> > TEST=mjsunit/regress/regress-crbug-600995
> > BUG=chromium:600995
> > LOG=n
> >
> > Committed: https://crrev.com/460bff5fb6af2bd79e610f89afdf6da9dba3cf0c
> > Cr-Commit-Position: refs/heads/master@{#35339}
>
> TBR=mvstanton@chromium.org,mstarzinger@chromium.org
>
> BUG=chromium:600995
> LOG=N
> NOTRY=true
>
> Committed: https://crrev.com/78049e9c4837f053575d6c71e53ae12fec99f1aa
> Cr-Commit-Position: refs/heads/master@{#35392}

TBR=mvstanton@chromium.org,mstarzinger@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:600995

Review URL: https://codereview.chromium.org/1876973002

Cr-Commit-Position: refs/heads/master@{#35398}

This logic mirrors what KeyedLoadICs are doing already.

BUG=chromium:602184
LOG=n

Review URL: https://codereview.chromium.org/1876793003

Cr-Commit-Position: refs/heads/master@{#35397}

Reason for revert:
Breaks gc mole:
https://build.chromium.org/p/client.v8/builders/V8%20Linux/builds/9421

Original issue's description:
> Fix printf formats
>
> The usage of __attribute__((format(x, y)) was either wrong or missing from multiple functions, leading to erroneous formats. This CL:
>
>  - Imports PRINTF_FORMAT macro from Chrome's src/base/compiler-specific.h.
>  - Uses it appropriately.
>  - Imports Chrome's base/format_macros.h mainly to fix size_t formats (further cleanup could be done).
>  - Fixes a bunch of incorrect formats.
>
> Original CL: https://codereview.chromium.org/1869433004
> Reverted in: https://codereview.chromium.org/1867383002
>
> R= jochen@chromium.org
> TBR= bmeurer@chromium.org, yangguo@chromium.org, ahaas@chromium.org
>
> Committed: https://crrev.com/bf505329288e1b75bab0e6800371a9aac40fa5cc
> Cr-Commit-Position: refs/heads/master@{#35394}

TBR=jochen@chromium.org,ahaas@chromium.org,bmeurer@chromium.org,yangguo@chromium.org,jfb@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1877823003

Cr-Commit-Position: refs/heads/master@{#35396}

This is useful for escape analysis, and helps upcoming changes to
type feedback gathering.

BUG=

Review URL: https://codereview.chromium.org/1670143002

Cr-Commit-Position: refs/heads/master@{#35395}

The usage of __attribute__((format(x, y)) was either wrong or missing from multiple functions, leading to erroneous formats. This CL:

 - Imports PRINTF_FORMAT macro from Chrome's src/base/compiler-specific.h.
 - Uses it appropriately.
 - Imports Chrome's base/format_macros.h mainly to fix size_t formats (further cleanup could be done).
 - Fixes a bunch of incorrect formats.

Original CL: https://codereview.chromium.org/1869433004
Reverted in: https://codereview.chromium.org/1867383002

R= jochen@chromium.org
TBR= bmeurer@chromium.org, yangguo@chromium.org, ahaas@chromium.org

Review URL: https://codereview.chromium.org/1877453002

Cr-Commit-Position: refs/heads/master@{#35394}

Otherwise they can't be found in the megamorphic cache, leading to repeated misses.

BUG=chromium:596825
LOG=n

Review URL: https://codereview.chromium.org/1874303002

Cr-Commit-Position: refs/heads/master@{#35393}

Revert of [compiler] Make feedback vector cope with flag changes. (patchset #1 id:1 of https://codereview.chromium.org/1869693003/ )

Reason for revert:
Blocks current roll: https://codereview.chromium.org/1876713002/ according to bisect: https://codereview.chromium.org/1872353002/#ps80001

Original issue's description:
> [compiler] Make feedback vector cope with flag changes.
>
> This fixes corner cases where the layout of feedback vectors baked into
> the snapshot is different from the expected layout, depending on some
> runtime flags. We make sure the feedback vector is regenereated for
> functions that are not compiled. Flag changes of this kind are only
> allowed when code is not serialized.
>
> An alternative solution would be to not serialize the feedback vector
> for such cases in the first place. That solution however would have a
> higher overhead, as it would required the serializer to be able to
> recognize feedback vectors while generating a snapshot.
>
> R=mvstanton@chromium.org
> TEST=mjsunit/regress/regress-crbug-600995
> BUG=chromium:600995
> LOG=n
>
> Committed: https://crrev.com/460bff5fb6af2bd79e610f89afdf6da9dba3cf0c
> Cr-Commit-Position: refs/heads/master@{#35339}

TBR=mvstanton@chromium.org,mstarzinger@chromium.org

BUG=chromium:600995
LOG=N
NOTRY=true

Review URL: https://codereview.chromium.org/1876103002

Cr-Commit-Position: refs/heads/master@{#35392}

This moves the computation of the {expected_nof_properties} for a shared
function to where the object is actually being allocated. This is done
after parsing when the literal has been populated already. The expected
number of properties is not mutated after parsing.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/1873173002

Cr-Commit-Position: refs/heads/master@{#35391}

BUG=535160
TBR=sergiyb@chromium.org, kjellander@chromium.org
NOTRY=true
NOPRESUBMIT=true

Review URL: https://codereview.chromium.org/1872423002

Cr-Commit-Position: refs/heads/master@{#35390}

Adds a ModulusStub for the modulo operator and lets TurboFan and Ignition make use of it.

Review URL: https://codereview.chromium.org/1876793002

Cr-Commit-Position: refs/heads/master@{#35389}

This makes sure that --hydrogen-filter only filters for Crankshaft, not
for TurboFan compilations. For TurboFan there is --turbo-filter as a
separate flag already. There no longer is a single flag to filter both
compilers at the same time, one can still specify both flags however.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1871343003

Cr-Commit-Position: refs/heads/master@{#35388}