This CLprepares the terrain for serialization/deserialization. It sets up
the instantiation stages such that we have a point wereh we can split off
obtaining the code from a snapshot, or snapshot. That point is after we
compile and produce the code table, but before we attach the
deoptimization info we use for stack tracing.

Opportunistically, performed more cleanup to improve maintainability:
- clarified sequential vs parallel compilation stages. FinishCompilation
was somewhat ambiguous in that it performed a few responsibilities:
compiling functions in the sequential case, and then populating the
linker and code tables.
- removed the "results" set, which is unnecessary. The linker simply
shares the function_code vector, and so do the compilation stages.
- populate the code table fixed array separately from compilation. This
falls out of the decisions above.

BUG=

Review-Url: https://codereview.chromium.org/2008043006
Cr-Commit-Position: refs/heads/master@{#36618}

This reverts commit 0aa3707d.

And removes the UnreachableObjectsFilter.

BUG=chromium:580959
LOG=n

Review-Url: https://codereview.chromium.org/1992913004
Cr-Commit-Position: refs/heads/master@{#36617}

Revert of [gn] Add unittests (patchset #7 id:120001 of https://codereview.chromium.org/2011853002/ )

Reason for revert:
Still http://crbug.com/615890

Original issue's description:
> [gn] Add unittests
>
> BUG=chromium:474921
> NOTRY=true
>
> Committed: https://crrev.com/67e549ec5b34ad02506abb2720c6a0851ae31f5e
> Cr-Commit-Position: refs/heads/master@{#36510}
>
> Committed: https://crrev.com/143b3d167d7014525d049d3ab53c73cf2592243c
> Cr-Commit-Position: refs/heads/master@{#36582}
>
> Committed: https://crrev.com/378a26c03efc74bda401daa5accda223cb266177
> Cr-Commit-Position: refs/heads/master@{#36606}

TBR=vogelheim@chromium.org,bmeurer@chromium.org,jochen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:474921

Review-Url: https://codereview.chromium.org/2026713002
Cr-Commit-Position: refs/heads/master@{#36616}

Reason for revert:
Still http://crbug.com/615890

Original issue's description:
> [gn] Add cctest
>
> BUG=chromium:474921
>
> Committed: https://crrev.com/52a6fced896e3f64ac56eb57bcdea78393642e0c
> Cr-Commit-Position: refs/heads/master@{#36517}
>
> Committed: https://crrev.com/65678bc67fc48dfe4dcab7fdd2c4b7e1d6e918f4
> Cr-Commit-Position: refs/heads/master@{#36586}
>
> TBR=jochen@chromium.org
>
> Committed: https://crrev.com/eea9fbe1858df23dd832ed8ddd284f98120d9e21
> Cr-Commit-Position: refs/heads/master@{#36607}

TBR=jochen@chromium.org,vogelheim@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:474921

Review-Url: https://codereview.chromium.org/2026703002
Cr-Commit-Position: refs/heads/master@{#36615}

BUG=v8:4483
R=littledan@chromium.org, yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2010693003
Cr-Commit-Position: refs/heads/master@{#36614}

This prevents the compiler from optimizing
  f64-to-tagged(tagged-to-f64(x)) ==> x
for non-number x (such as undefined).

Review-Url: https://codereview.chromium.org/2027593002
Cr-Commit-Position: refs/heads/master@{#36613}

For values with canonical representation (i.e. not Number, Simd128Value
or Number) we can turn a strict equality comparison to a direct pointer
comparison. This removes the weird performance cliff when using a null
or undefined constant instead of the literals.

R=jarin@chromium.org
BUG=v8:5042

Review-Url: https://codereview.chromium.org/2027603002
Cr-Commit-Position: refs/heads/master@{#36612}

When we moved the String.fromCharCode builtin to C++, we slightly
regressed the fast single character code argument case. Recovered some
of the performance by implementing the builtin using the TurboFan
CodeStubAssembler.

Drive-by-fix: Make sure the stack trace from the implicit ToNumber
conversion in String.fromCharCode includes the builtin by adding a
regression test for that.

R=yangguo@chromium.org
BUG=chromium:609831,chromium:613947,v8:5049

Review-Url: https://codereview.chromium.org/2021143003
Cr-Commit-Position: refs/heads/master@{#36611}

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2026643003
Cr-Commit-Position: refs/heads/master@{#36610}

Revert of Reland "[heap] Fine-grained JSArrayBuffer tracking" (patchset #2 id:20001 of https://codereview.chromium.org/2024063002/ )

Reason for revert:
Breaking
  http://build.chromium.org/p/client.v8/builders/V8%20Linux64%20-%20avx2/builds/7972

Original issue's description:
> Track based on JSArrayBuffer addresses on pages instead of the attached
> backing store.
>
> Details of tracking:
> - Scavenge: New space pages are processes in bulk on the main thread
> - MC: Unswept pages are processed in bulk in parallel. All other pages
>   are processed by the sweeper concurrently.
>
> BUG=chromium:611688
> LOG=N
> TEST=cctest/test-array-buffer-tracker/*
> CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_arm64_gc_stress_dbg,v8_linux_gc_stress_dbg,v8_mac_gc_stress_dbg,v8_linux64_tsan_rel,v8_mac64_asan_rel
>
> Committed: https://crrev.com/089da007bb990b5b29aab257aa836fdd3f3b8ce0
> Cr-Commit-Position: refs/heads/master@{#36608}

TBR=hpayer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:611688

Review-Url: https://codereview.chromium.org/2028503003
Cr-Commit-Position: refs/heads/master@{#36609}

backing store.

Details of tracking:
- Scavenge: New space pages are processes in bulk on the main thread
- MC: Unswept pages are processed in bulk in parallel. All other pages
  are processed by the sweeper concurrently.

BUG=chromium:611688
LOG=N
TEST=cctest/test-array-buffer-tracker/*
CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_arm64_gc_stress_dbg,v8_linux_gc_stress_dbg,v8_mac_gc_stress_dbg,v8_linux64_tsan_rel,v8_mac64_asan_rel

Review-Url: https://codereview.chromium.org/2024063002
Cr-Commit-Position: refs/heads/master@{#36608}

BUG=chromium:474921

Committed: https://crrev.com/52a6fced896e3f64ac56eb57bcdea78393642e0c
Cr-Commit-Position: refs/heads/master@{#36517}

Committed: https://crrev.com/65678bc67fc48dfe4dcab7fdd2c4b7e1d6e918f4
Cr-Commit-Position: refs/heads/master@{#36586}

TBR=jochen@chromium.org

Review-Url: https://codereview.chromium.org/2007143003
Cr-Commit-Position: refs/heads/master@{#36607}

BUG=chromium:474921
NOTRY=true

Committed: https://crrev.com/67e549ec5b34ad02506abb2720c6a0851ae31f5e
Cr-Commit-Position: refs/heads/master@{#36510}

Committed: https://crrev.com/143b3d167d7014525d049d3ab53c73cf2592243c
Cr-Commit-Position: refs/heads/master@{#36582}

Review-Url: https://codereview.chromium.org/2011853002
Cr-Commit-Position: refs/heads/master@{#36606}

Revert of [gn] Add unittests (patchset #6 id:100001 of https://codereview.chromium.org/2011853002/ )

Reason for revert:
http://crbug.com/615890

Original issue's description:
> [gn] Add unittests
>
> BUG=chromium:474921
> NOTRY=true
>
> Committed: https://crrev.com/67e549ec5b34ad02506abb2720c6a0851ae31f5e
> Cr-Commit-Position: refs/heads/master@{#36510}
>
> Committed: https://crrev.com/143b3d167d7014525d049d3ab53c73cf2592243c
> Cr-Commit-Position: refs/heads/master@{#36582}

TBR=vogelheim@chromium.org,bmeurer@chromium.org,jochen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:474921

Review-Url: https://codereview.chromium.org/2022893002
Cr-Commit-Position: refs/heads/master@{#36605}

R=cbruni@chromium.org

Review-Url: https://codereview.chromium.org/2026563002
Cr-Commit-Position: refs/heads/master@{#36604}

Reason for revert:
Blocks Roll https://bugs.chromium.org/p/chromium/issues/detail?id=615890

Original issue's description:
> [gn] Add cctest
>
> BUG=chromium:474921
> NOTRY=true
>
> Committed: https://crrev.com/52a6fced896e3f64ac56eb57bcdea78393642e0c
> Cr-Commit-Position: refs/heads/master@{#36517}
>
> Committed: https://crrev.com/65678bc67fc48dfe4dcab7fdd2c4b7e1d6e918f4
> Cr-Commit-Position: refs/heads/master@{#36586}

TBR=vogelheim@chromium.org,jochen@chromium.org,machenbach@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:474921

Review-Url: https://codereview.chromium.org/2021213002
Cr-Commit-Position: refs/heads/master@{#36603}

Rolling v8/build to 25d5f7b68ce4be271df55c6d4f1e492ec9e0c369

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

Review-Url: https://codereview.chromium.org/2021183002
Cr-Commit-Position: refs/heads/master@{#36602}

Port 63ea3a50

Original commit message:

    Previously, we used the lowest bit for something else.

R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2021133002
Cr-Commit-Position: refs/heads/master@{#36601}

Port 56d90782

Original commit message:

    In Crankshaft, we would install special ICs that didn't need a vector and slot
    in the MEGAMORPHIC case. This optimization limits our hand against future
    improvements.

R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2023983002
Cr-Commit-Position: refs/heads/master@{#36600}

Previously, we used the lowest bit for something else.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2019393002
Cr-Commit-Position: refs/heads/master@{#36599}

R=littledan@chromium.org

Review-Url: https://codereview.chromium.org/2021053002
Cr-Commit-Position: refs/heads/master@{#36598}

In Crankshaft, we would install special ICs that didn't need a vector and slot
in the MEGAMORPHIC case. This optimization limits our hand against future
improvements.

BUG=

Review-Url: https://codereview.chromium.org/2019313003
Cr-Commit-Position: refs/heads/master@{#36597}

  - Move the samplers related part out of SignalHandler class (remove friendship).
  - Make the SamplerManager class a singleton.
  - Minor tweaks.

BUG=v8:4789

Review-Url: https://codereview.chromium.org/2018773002
Cr-Commit-Position: refs/heads/master@{#36596}

Expose more or less the full functionality of the KeyAccumulator in the API:
- use the PropertyFilter introduced for GetOwnPropertyNames
- use KeyCollectionLimit for OWN_ONLY or INLCUDE_PROTOS
- use IndexFilter to eithe SKIP_INDICES or INCLUDE_INDICES

Rewire Object::GetOwnPropertyNames to use GetPropertyNames.

BUG=chromium:148757

Review-Url: https://codereview.chromium.org/2002203002
Cr-Commit-Position: refs/heads/master@{#36595}

Users of this api should use a combination of |RequestInterrupt| and
|GCCallback| (see |AddGCPrologueCallback| and friends) to keep track allocated
memory.

BUG=v8:4813
LOG=Y
R=jochen@chromium.org

Review-Url: https://codereview.chromium.org/1991293002
Cr-Commit-Position: refs/heads/master@{#36594}

Revert of Reland "[heap] Fine-grained JSArrayBuffer tracking" (patchset #3 id:60001 of https://codereview.chromium.org/2026463002/ )

Reason for revert:
Investigating new arm simulator failure:
  https://build.chromium.org/p/client.v8.ports/builders/V8%20Linux%20-%20arm%20-%20sim/builds/851/steps/Check%20-%20novfp3/logs/box2d

Original issue's description:
> Reland "[heap] Fine-grained JSArrayBuffer tracking"
>
> Track based on JSArrayBuffer addresses on pages instead of the attached
> backing store.
>
> Details of tracking:
> - Scavenge: New space pages are processes in bulk on the main thread
> - MC: Unswept pages are processed in bulk in parallel. All other pages
>   are processed by the sweeper concurrently.
>
> BUG=chromium:614730, chromium:611688
> LOG=N
> CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_arm64_gc_stress_dbg,v8_linux_gc_stress_dbg,v8_mac_gc_stress_dbg,v8_linux64_tsan_rel,v8_mac64_asan_rel
>
> Committed: https://crrev.com/bc0fb6e83eb7351f52bfd6f780bb6c12bd87c58c
> Cr-Commit-Position: refs/heads/master@{#36592}

TBR=hpayer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:614730, chromium:611688

Review-Url: https://codereview.chromium.org/2021893002
Cr-Commit-Position: refs/heads/master@{#36593}

Track based on JSArrayBuffer addresses on pages instead of the attached
backing store.

Details of tracking:
- Scavenge: New space pages are processes in bulk on the main thread
- MC: Unswept pages are processed in bulk in parallel. All other pages
  are processed by the sweeper concurrently.

BUG=chromium:614730, chromium:611688
LOG=N
CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_arm64_gc_stress_dbg,v8_linux_gc_stress_dbg,v8_mac_gc_stress_dbg,v8_linux64_tsan_rel,v8_mac64_asan_rel

Review-Url: https://codereview.chromium.org/2026463002
Cr-Commit-Position: refs/heads/master@{#36592}

it's referenced from isolate.gypi which in turn is used in
non-standalone builds as well.

BUG=chromium:609107
R=machenbach@chromium.org

Review-Url: https://codereview.chromium.org/2023783003
Cr-Commit-Position: refs/heads/master@{#36591}

Fix failure in RunWasmInterpreted_LoadMemI32_const_oob_misaligned on architecures that don't support unaligned access

BUG=cctest/test-run-wasm/RunWasmInterpreted_LoadMemI32_const_oob_misaligned

Review-Url: https://codereview.chromium.org/2026553002
Cr-Commit-Position: refs/heads/master@{#36590}

Jaideep has been regularly contributing PPC and S390 changes recently.
Adding him as owner/reviewer to PPC / S390 specific directories.

R=joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com
BUG=

Review-Url: https://codereview.chromium.org/2024533003
Cr-Commit-Position: refs/heads/master@{#36589}

R=rossberg@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2026543002
Cr-Commit-Position: refs/heads/master@{#36588}

BUG=chromium:615489

Review-Url: https://codereview.chromium.org/2020743002
Cr-Commit-Position: refs/heads/master@{#36587}

BUG=chromium:474921
NOTRY=true

Committed: https://crrev.com/52a6fced896e3f64ac56eb57bcdea78393642e0c
Cr-Commit-Position: refs/heads/master@{#36517}

Review-Url: https://codereview.chromium.org/2007143003
Cr-Commit-Position: refs/heads/master@{#36586}

Utilize the previously introduced construct call counts in the
JSInliningHeuristic to also handle constructor calls properly.

R=mvstanton@chromium.org

Review-Url: https://codereview.chromium.org/2026513003
Cr-Commit-Position: refs/heads/master@{#36585}

The NumberIsHoleNaN operator used to test the lower word of the double
input which is obviously wrong.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2022753002
Cr-Commit-Position: refs/heads/master@{#36584}

BUG=v8:4907

Review-Url: https://codereview.chromium.org/2026503002
Cr-Commit-Position: refs/heads/master@{#36583}

BUG=chromium:474921
NOTRY=true

Committed: https://crrev.com/67e549ec5b34ad02506abb2720c6a0851ae31f5e
Cr-Commit-Position: refs/heads/master@{#36510}

Review-Url: https://codereview.chromium.org/2011853002
Cr-Commit-Position: refs/heads/master@{#36582}

BUG=
NOTRY=true

Review-Url: https://codereview.chromium.org/2020983002
Cr-Commit-Position: refs/heads/master@{#36581}

R=ulan@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2021823002
Cr-Commit-Position: refs/heads/master@{#36580}

BUG=chromium:615770
LOG=N

Review-Url: https://codereview.chromium.org/2022743002
Cr-Commit-Position: refs/heads/master@{#36579}