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}

Now that the scope chain is deserialized directly from the chain of
{ScopeInfo} objects, it is no longer needed to provide a context. This
makes the {AllowsLazyCompilationWithoutContext} predicate coincide with
the more general {AllowsLazyCompilation}. Remove the former.

R=jochen@chromium.org

Review-Url: https://codereview.chromium.org/2399853002
Cr-Commit-Position: refs/heads/master@{#40042}

With this CL, we devolve all Constants introduced as they are with an object handle into

* Range - for integers
* Nan
* MinusZero
* OtherNumberConstant - for doubles
* HeapConstant

We reduce the amount we have to inspect an object handle during optimization. Also, simplifications result. For example, you never have to check if a Range contains a HeapConstant.

BUG=

Review-Url: https://codereview.chromium.org/2381523002
Cr-Commit-Position: refs/heads/master@{#40041}

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

Review-Url: https://codereview.chromium.org/2401563002
Cr-Commit-Position: refs/heads/master@{#40040}

Recent changes in Segment class caused many tests to fail on mips32
because of an unaligned read error. Setting the alignment to 8 for mips
fixes the issue. Accessing doubles on mips32 must be eight bit aligned.

BUG=

Review-Url: https://codereview.chromium.org/2390303003
Cr-Commit-Position: refs/heads/master@{#40039}

Revert of [wasm] Refactor import handling for 0xC. (patchset #10 id:180001 of https://codereview.chromium.org/2390113003/ )

Reason for revert:
Failes a few GC stress tests.https://chromegw.corp.google.com/i/client.v8/builders/V8%20Linux%20-%20gc%20stress/builds/6253

Original issue's description:
> [wasm] Refactor import handling for 0xC.
>
> 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
> Cr-Commit-Position: refs/heads/master@{#40033}

TBR=mtrofin@chromium.org,ahaas@chromium.org,bradnelson@chromium.org,titzer@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/2395133002
Cr-Commit-Position: refs/heads/master@{#40038}

TBR=machenbach@chromium.org
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2397153002
Cr-Commit-Position: refs/heads/master@{#40037}

Flag getters are implemented as TurboFan stubs while the rest are written as
C++. This distinction is somewhat arbitrary and more getters could be ported to
TurboFan in the future.

BUG=v8:5339

Review-Url: https://codereview.chromium.org/2389233002
Cr-Commit-Position: refs/heads/master@{#40036}

R=jarin@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2401553002
Cr-Commit-Position: refs/heads/master@{#40035}

BUG=chromium:648568

Review-Url: https://codereview.chromium.org/2397473004
Cr-Commit-Position: refs/heads/master@{#40034}

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=

Review-Url: https://codereview.chromium.org/2390113003
Cr-Commit-Position: refs/heads/master@{#40033}

In an anonymous namespace, all methods are already treated like being
static, so no need for these keywords.

Review-Url: https://codereview.chromium.org/2384403006
Cr-Commit-Position: refs/heads/master@{#40032}

This switches the {ParseInfo} constructor to always determine the outer
scope info from the shared function info instead of a concrete closure.
It is a precursor to deprecate the constructor taking closures entirely
and hence make the fact that we can parse without a closure explicit.

R=jochen@chromium.org
BUG=v8:2206

Review-Url: https://codereview.chromium.org/2397053003
Cr-Commit-Position: refs/heads/master@{#40031}

BUG=chromium:653264
TEST=cctest/test-run-wasm-module/GrowMemoryZero
R=titzer@chromium.org

Review-Url: https://codereview.chromium.org/2389263005
Cr-Commit-Position: refs/heads/master@{#40030}

BUG=
R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2393923003
Cr-Commit-Position: refs/heads/master@{#40029}

R=titzer@chromium.org

Review-Url: https://codereview.chromium.org/2388303008
Cr-Commit-Position: refs/heads/master@{#40028}

The generic implementations for typeof, strict equality and ToBoolean
don't need a context, so we can just pass the NoContextConstant (which
is Smi zero) instead, to reduce the live ranges for the context.

R=mvstanton@chromium.org

Review-Url: https://codereview.chromium.org/2400633002
Cr-Commit-Position: refs/heads/master@{#40027}

The scavenger should never consider mark bits for promotion/copy as this creates
weird livetimes at the start of incremental marking. E.g. consider an object
marked black by the marker at the start of incremental marking. A scavenge would
promote it to the old generation although it could --and for short-living
objects actually does-- become unreachable during marking

Also, keeping this invariant significantly simplifies young generation mark
compacting as we can compare against the scavenging decision without keeping
different sets of markbits.

BUG=chromium:651354
R=hpayer@chromium.org

Review-Url: https://codereview.chromium.org/2397713002
Cr-Commit-Position: refs/heads/master@{#40026}

... because the latter automatically respects the desired calling convention.

BUG=v8:5408

Review-Url: https://codereview.chromium.org/2398683004
Cr-Commit-Position: refs/heads/master@{#40025}

because ownership over it is not obviously clear
and leads to errors.

Review-Url: https://codereview.chromium.org/2366283003
Cr-Commit-Position: refs/heads/master@{#40024}

... because the latter automatically respects the desired calling convention.

BUG=v8:5408

Review-Url: https://codereview.chromium.org/2396023002
Cr-Commit-Position: refs/heads/master@{#40023}

Emit code like this

  cmpq reg, [kRootRegister + offset]

when selecting instructions for comparisons with immortal, immovable
roots. This reduces register pressure as we don't need to load those
roots into registers first.

R=jarin@chromium.org
TBR=hpayer@chromium.org

Review-Url: https://codereview.chromium.org/2396923003
Cr-Commit-Position: refs/heads/master@{#40022}

Reland of "[turbofan] Osr value typing + dynamic type checks on entry. (patchset #5 id:80001 of https://codereview.chromium.org/2384113002/ )"

Fixes:

- Remove OsrGuards on frame specialization (for asm.js).
- Handle the rename in the walk for native context.
- Fix LoadContext effect wiring for Osr context chains.

Review-Url: https://codereview.chromium.org/2388303006
Cr-Commit-Position: refs/heads/master@{#40021}

Specifically an attempt to address a 3.5% regression on the total load
time on cnn introduced by https://codereview.chromium.org/2113673002.

Non-refactoring effect of this CL is to reduce the number of branches in
CodeStubAssembler-generated loops iterating over FixedArrays from
two to one.

LOG=N
BUG=v8:5423

Review-Url: https://codereview.chromium.org/2380953002
Cr-Commit-Position: refs/heads/master@{#40020}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/475d5b3..67604e1

Rolling v8/buildtools: https://chromium.googlesource.com/chromium/buildtools/+log/5fd6695..39b1db2

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

Review-Url: https://codereview.chromium.org/2397993002
Cr-Commit-Position: refs/heads/master@{#40019}

When we create native promises as part of PromiseThen, we don't have
to create resolving closures. The closure will only ever be called
once from PromiseHandle, therefore we don't need the alreadyResolved
check.

This results in a 21.76% improvement in the bluebird benchmark
over 5 runs.

BUG=v8:5046

Review-Url: https://codereview.chromium.org/2396763002
Cr-Commit-Position: refs/heads/master@{#40018}

Port 7a82be3d

Original commit message:

    The duplicated enum values are only used by the FastNewClosureStub,
    so inline them there, with the help of one new constant (kFunctionKindShift)
    in SharedFunctionInfo.

R=adamk@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/2391343003
Cr-Commit-Position: refs/heads/master@{#40017}

v8::Integer::Value() method returns int64 but all scriptIds are 32 bit based. We can safely cast int64 into int here to make compilers happy.

R=dgozman@chromium.org

Review-Url: https://codereview.chromium.org/2394973002
Cr-Commit-Position: refs/heads/master@{#40016}

Adds string type feedback to Ignition's AddWithFeedback code stub, for now only
adding a special case for when both lhs and rhs are strings. This improves
octane's splay by >100%.

BUG=v8:5400

Committed: https://crrev.com/fb4ae2239d37adaf0321165034050316914de708
Committed: https://crrev.com/bf1a94f1b269914856a8c8763fd282367f066c67
Review-Url: https://codereview.chromium.org/2392533002
Cr-Original-Original-Commit-Position: refs/heads/master@{#39987}
Cr-Original-Commit-Position: refs/heads/master@{#39996}
Cr-Commit-Position: refs/heads/master@{#40015}

On PPC64 linux the OS page size is 64KB, therefore when the
snapshot is created the serialized heap already has LO_SPACE
allocated(the allocation goes beyond the 1st page of
CODE_SPACE and hence LO_SPACE is allocated).
I've updated the testcase to check if the delta
of the LO_SPACE is zero.

R=mlippautz@chromium.org, ulan@chromium.org, vogelheim@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2394893002
Cr-Commit-Position: refs/heads/master@{#40014}

Allow fround to take values without dots for globals (the spec allows this
subtly).

Drop over-restrictive assert preventing floating point globals from working.

BUG=v8:4203
R=jpp@chromium.org,aseemgarg@chromium.org

Review-Url: https://codereview.chromium.org/2397823003
Cr-Commit-Position: refs/heads/master@{#40013}

GCC on S390 31-bit treats size_t as 'long unsigned int', which
is incompatible with %d format specifier that expects an 'int'.
Using the appropriate macro (PRIuS) instead.

R=mlippautz@chromium.org, hpayer@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2398703002
Cr-Commit-Position: refs/heads/master@{#40012}

Review-Url: https://codereview.chromium.org/2376613003
Cr-Commit-Position: refs/heads/master@{#40011}

NOTRY=true
NOTREECHECKS=true
NOPRESUBMIT=true
TBR=hablich@chromium.org

Review-Url: https://codereview.chromium.org/2392463007
Cr-Commit-Position: refs/heads/master@{#40010}

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

Review-Url: https://codereview.chromium.org/2396933002
Cr-Commit-Position: refs/heads/master@{#40009}

Reland https://codereview.chromium.org/2373983004/, reverted in
4e5a4d93.

Reason: CL is not responsible for Win32 Debug failures (see https://build.chromium.org/p/client.v8/builders/V8%20Win32%20-%20debug/builds/5031)

------------------------------------------------------------------------------

Implement the logic for StringIterator.prototype.next in the JSBuiltinReducer in order to allow inlining when the receiver is a JS_STRING_ITERATOR_TYPE map, built ontop of the SimplifiedOperators StringCharCodeAt and the newly added StringFromCodePoint.

Also introduces a new StringFromCodePoint simplified op which may be useful for other String builtins, such as String.fromCodePoint()

BUG=v8:5388
TBR=bmeurer@chromium.org, mstarzinger@chromium.org

Review-Url: https://codereview.chromium.org/2394823003
Cr-Commit-Position: refs/heads/master@{#40008}

BUG=chromium:496666
R=dgozman@chromium.org

Review-Url: https://codereview.chromium.org/2391323002
Cr-Commit-Position: refs/heads/master@{#40007}

An attempt to fix memory regression (r38047) caused another regression
because custom capacity chosen for names dictionary implied reallocations
during initialization in some cases.

BUG=chromium:625894,chromium:632231

Review-Url: https://codereview.chromium.org/2394873002
Cr-Commit-Position: refs/heads/master@{#40006}

The duplicated enum values are only used by the FastNewClosureStub,
so inline them there, with the help of one new constant (kFunctionKindShift)
in SharedFunctionInfo.

Review-Url: https://codereview.chromium.org/2390043003
Cr-Commit-Position: refs/heads/master@{#40005}

R=jochen@chromium.org
BUG=chromium:651333, v8:4947

Review-Url: https://codereview.chromium.org/2391273002
Cr-Commit-Position: refs/heads/master@{#40004}