This reverts commit 7db0ecde.

Manual revert since automatic revert is too large for the web interface.

BUG=
TBR=bmeurer@chromium.org,mstarzinger@chromium.org,yangguo@chromium.org,ahaas@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true

Review-Url: https://codereview.chromium.org/2396353002
Cr-Commit-Position: refs/heads/master@{#40082}

Revert of [turbofan] Discard the shared code entry in the optimized code map. (patchset #3 id:40001 of https://codereview.chromium.org/2401653002/ )

Reason for revert:
Possible GCSTRESS failure, investigating.

Original issue's description:
> [turbofan] Discard the shared code entry in the optimized code map.
>
> At one time, we hoped to generate the same code for different
> native contexts. But in truth, much performance comes from optimizing
> on the native context. Now we abandon this pathway.
>
> BUG=
>
> Committed: https://crrev.com/55af3c44c99a6e4cd6d53df775023d760ad2b2c3
> Cr-Commit-Position: refs/heads/master@{#40079}

TBR=mstarzinger@chromium.org,ishell@chromium.org,bmeurer@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/2403453002
Cr-Commit-Position: refs/heads/master@{#40081}

BUG=

Review-Url: https://codereview.chromium.org/2381843002
Cr-Commit-Position: refs/heads/master@{#40080}

At one time, we hoped to generate the same code for different
native contexts. But in truth, much performance comes from optimizing
on the native context. Now we abandon this pathway.

BUG=

Review-Url: https://codereview.chromium.org/2401653002
Cr-Commit-Position: refs/heads/master@{#40079}

The _ParseException function in testcfg.py made incorrect assumptions about how
exceptions are printed (I believe it expected a trace like that produced by
Error).

R=littledan@chromium.org
BUG=v8:5136

Review-Url: https://codereview.chromium.org/2386103010
Cr-Commit-Position: refs/heads/master@{#40078}

In CreateModuleObjectFromBytes, pointers to the raw bytes will be stored
inside the decoded WasmModule, and still used after allocating V8 stuff
in WasmModule::CompileFunctions. We thus cannot pass a raw pointer to
the V8 heap.
Fix this by copying the bytes before decoding.

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

Review-Url: https://codereview.chromium.org/2402633002
Cr-Commit-Position: refs/heads/master@{#40077}

R=mtrofin@chromium.org,gdeepti@chromium.org
BUG=chromium:575167

Review-Url: https://codereview.chromium.org/2392943006
Cr-Commit-Position: refs/heads/master@{#40076}

BUG=chromium:648568

Review-Url: https://codereview.chromium.org/2397373002
Cr-Commit-Position: refs/heads/master@{#40075}

For now keep the logic in compiler.cc and add a DCHECK that the scopes
and compiler.cc agree.

Use this knowledge to only created ScopeInfos for literals we'll
actually compile.

BUG=v8:5394,v8:5422
R=marja@chromium.org,verwaest@chromium.org

Review-Url: https://codereview.chromium.org/2399833002
Cr-Commit-Position: refs/heads/master@{#40074}

R=mvstanton@chromium.org
BUG=v8:5267

Review-Url: https://codereview.chromium.org/2397253002
Cr-Commit-Position: refs/heads/master@{#40073}

This implicitly convers parseFloat on the global object as well, since
it's the same function. This is mostly straight-forward, but adds
another fast case for HeapNumbers as well.

R=ishell@chromium.org

Review-Url: https://codereview.chromium.org/2395373002
Cr-Commit-Position: refs/heads/master@{#40072}

Revert of [esnext] ship String.prototype.padStart / String.prototype.padEnd (patchset #1 id:1 of https://codereview.chromium.org/2382193002/ )

Reason for revert:
Causes several GC bugs, e.g. https://build.chromium.org/p/client.v8.ports/builders/V8%20Linux%20-%20arm64%20-%20sim%20-%20gc%20stress/builds/2858/steps/Mjsunit/logs/debug-constructed-by

Original issue's description:
> [esnext] ship String.prototype.padStart / String.prototype.padEnd
>
> Enable the --harmony-string-padding flag by default
>
> BUG=v8:4954
> R=adamk@chromium.org, littledan@chromium.org
>
> Committed: https://crrev.com/8352a0feaccfd9a19f3b38564ed2c0859dd6e3d5
> Cr-Commit-Position: refs/heads/master@{#40060}

TBR=littledan@chromium.org,adamk@chromium.org,foolip@chromium.org,caitp@igalia.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4954

Review-Url: https://codereview.chromium.org/2398183003
Cr-Commit-Position: refs/heads/master@{#40071}

R=marja@chromium.org

Review-Url: https://codereview.chromium.org/2392303004
Cr-Commit-Position: refs/heads/master@{#40070}

R=adamk@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2394173002
Cr-Commit-Position: refs/heads/master@{#40069}

Reland of land "Turn libbase into a component" (patchset #1 id:1 of https://codereview.chromium.org/2396933002/ )

Reason for revert:
let's see whether it sticks this time

Original issue's description:
> Revert of Reland "Turn libbase into a component" (patchset #1 id:1 of https://codereview.chromium.org/2395553002/ )
>
> Reason for revert:
> Speculative revert due to very strange-looking win/dbg failures
> which reference SignedDivisionByConstant:
>
> https://build.chromium.org/p/client.v8/builders/V8%20Win64%20-%20debug/builds/12736
>
> Original issue's description:
> > Reland "Turn libbase into a component"
> >
> > Original issue's description:
> > > Turn libbase into a component
> > >
> > > This is a precondition for turning libplatform into a component
> > >
> > > BUG=v8:5412
> > > R=jgruber@chromium.org,machenbach@chromium.org
> > > CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_chromium_compile_
> > dbg_ng;master.tryserver.chromium.android:android_clang_dbg_recipe
> > >
> > > Committed: https://crrev.com/614e615775f732d71b5ee94ed29737d8de687104
> > > Cr-Commit-Position: refs/heads/master@{#39950}
> >
> > BUG=v8:5412
> > TBR=jgruber@chromium.org,machenbach@chromium.org
> > CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_chromium_compile_dbg_ng;master.tryserver.chromium.android:android_clang_dbg_recipe;master.tryserver.chromium.mac:mac_chromium_compile_dbg_ng
> >
> > Committed: https://crrev.com/17cb51254cafa932025e9980b60f89f756d411cb
> > Cr-Commit-Position: refs/heads/master@{#39969}
>
> TBR=jgruber@chromium.org,machenbach@chromium.org,jochen@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=v8:5412
>
> Committed: https://crrev.com/e75b9f6ed5da39e6c7a8d70cf48afbc9958afc85
> Cr-Commit-Position: refs/heads/master@{#40009}

TBR=jgruber@chromium.org,machenbach@chromium.org,adamk@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=v8:5412

Review-Url: https://codereview.chromium.org/2399323002
Cr-Commit-Position: refs/heads/master@{#40068}

 - Added gating code in the module-decoder to allow SIMD code only when
 it can be decoded correctly
 - SIMD128 values should not be exported to JS
 - Try/Catch should not be available in asmjs modules
 - Trivial fixes for S128  values

BUG=chromium:648079

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

Review-Url: https://codereview.chromium.org/2400863003
Cr-Commit-Position: refs/heads/master@{#40067}

Review-Url: https://codereview.chromium.org/2399933005
Cr-Commit-Position: refs/heads/master@{#40066}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/67604e1..792a87c

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clan/+log/1f92f99..30c5a8b

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

Review-Url: https://codereview.chromium.org/2393083006
Cr-Commit-Position: refs/heads/master@{#40065}

Only subset of internal properties can be useful in preview, report only them.

BUG=chromium:653610
R=dgozman@chromium.org

Review-Url: https://codereview.chromium.org/2399003003
Cr-Commit-Position: refs/heads/master@{#40064}

Strongly typing module_bytes needs a patch for the
serialization code.

Serialization bypasses module bytes, so their presence can't
be compulsory.

BUG=

Review-Url: https://codereview.chromium.org/2397303002
Cr-Commit-Position: refs/heads/master@{#40063}

Use information in the WasmCompiledModule instead.

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

Review-Url: https://codereview.chromium.org/2396043002
Cr-Commit-Position: refs/heads/master@{#40062}

I am removing three fields from the wasm object in a follow-up commit,
and using information in the compiled module instead. In order to not
weaken the verification, this commit adds appropriate checks on the
compiled module.

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

Review-Url: https://codereview.chromium.org/2394663008
Cr-Commit-Position: refs/heads/master@{#40061}

Enable the --harmony-string-padding flag by default

BUG=v8:4954
R=adamk@chromium.org, littledan@chromium.org

Review-Url: https://codereview.chromium.org/2382193002
Cr-Commit-Position: refs/heads/master@{#40060}

Port 0c168a90

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

Review-Url: https://codereview.chromium.org/2397193003
Cr-Commit-Position: refs/heads/master@{#40059}

One step closer to the informally-agreed upon specification
that structured cloning will always succeed, meaning, if
we fail to deserialize (e.g. because version mismatch in
serialized format and v8 version), we recompile.

As part of this work, the deserializer will need to become
more resilient to invalid input data, and fail graciously
rather than CHECK-ing. This CL addresses some of that,
sufficient to unblock the current serialization tests.
Subsequent CLs will add more testing and the appropriate
fixes.

BUG=639090

Review-Url: https://codereview.chromium.org/2395793003
Cr-Commit-Position: refs/heads/master@{#40058}

d8 now elides './' when constructing absolute paths.
'../' is still not normalized.

R=neis@chromium.org
BUG=v8:1569

Review-Url: https://codereview.chromium.org/2393243002
Cr-Commit-Position: refs/heads/master@{#40057}

This patch sets `this` to be undefined when calling resolve and reject
functions attached to the deferred.

BUG=v8:5476

Review-Url: https://codereview.chromium.org/2399053003
Cr-Commit-Position: refs/heads/master@{#40056}

Introduce AccessCompilerData which hangs off the Isolate, and initialize
it when the first PropertyAccessCompiler is instantiated. This avoids
TSAN failures when trying to access load/store calling convention arrays.

BUG=v8:5427

Review-Url: https://codereview.chromium.org/2389313002
Cr-Commit-Position: refs/heads/master@{#40055}

A new V8 API object v8::TracingCpuProfiler is introduced.
Client can create it on an isolate to enable JS CPU profiles collected
during tracing session.

Once the v8.cpu_profile2 tracing category is enabled the profiler emits
CpuProfile and CpuProfileChunk events with the profile data.

BUG=chromium:406277

Review-Url: https://codereview.chromium.org/2396733002
Cr-Commit-Position: refs/heads/master@{#40054}

R=ishell@chromium.org

Review-Url: https://codereview.chromium.org/2395003002
Cr-Commit-Position: refs/heads/master@{#40053}

TBR=dgozman@chromium.org

Review-Url: https://codereview.chromium.org/2397193002
Cr-Commit-Position: refs/heads/master@{#40052}

BUG=v8:5431

Review-Url: https://codereview.chromium.org/2372113004
Cr-Commit-Position: refs/heads/master@{#40051}

Imports and exports in 0xC can be much more than functions, including
tables, memories, and globals. This CL refactors the underlying
organization of imports and exports to support these new import types.

BUG=

Committed: https://crrev.com/599f8a83420346d9cba5ff97bd2a7520468207b6
Review-Url: https://codereview.chromium.org/2390113003
Cr-Original-Commit-Position: refs/heads/master@{#40033}
Cr-Commit-Position: refs/heads/master@{#40050}

BUG=chromium:406277

Review-Url: https://codereview.chromium.org/2399463004
Cr-Commit-Position: refs/heads/master@{#40049}

BUG=v8:5409

Committed: https://crrev.com/a124feb0760896c8be61de08004a08c3bc9b4b3f
Review-Url: https://codereview.chromium.org/2348303002
Cr-Original-Commit-Position: refs/heads/master@{#39633}
Cr-Commit-Position: refs/heads/master@{#40048}

There's no point going through all the checks in the Add stub when we
already know that both sides are strings.

Review-Url: https://codereview.chromium.org/2395083002
Cr-Commit-Position: refs/heads/master@{#40047}

Caught with libfuzzer.

BUG=chromium:148757

Review-Url: https://codereview.chromium.org/2394983002
Cr-Commit-Position: refs/heads/master@{#40046}

This enables the {BytecodeGraphBuilder} whenever heuristics in the
compilation pipeline determine both Ignition and TurboFan to be used.
There no longer needs to be an explicit flag passed in order to build
graphs from bytecode.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2363413005
Cr-Commit-Position: refs/heads/master@{#40045}

BUG=v8:5409

Committed: https://crrev.com/37c688a24578e787d3d8941093563ed049c3497e
Review-Url: https://codereview.chromium.org/2335343007
Cr-Original-Commit-Position: refs/heads/master@{#39631}
Cr-Commit-Position: refs/heads/master@{#40044}

Revert of [heap] Concurrent slot filtering in sweeper threads. (patchset #4 id:60001 of https://codereview.chromium.org/2401563002/ )

Reason for revert:
Crashing.

Original issue's description:
> [heap] Concurrent slot filtering in sweeper threads.
>
> This is an intermediate step for concurrent slot filtering. This CL already makes filtering concurrent, but does not integrate it in the actual sweeping. This will be done in two follow up CLs. One for the regular slot set and one for the typed slot set.
>
> BUG=chromium:648568
>
> Committed: https://crrev.com/1f89d369fc952a2826f9f62901fb84fcf30920d7
> Cr-Commit-Position: refs/heads/master@{#40040}

TBR=ulan@chromium.org,mlippautz@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:648568

Review-Url: https://codereview.chromium.org/2399003002
Cr-Commit-Position: refs/heads/master@{#40043}