Port e607e12e

Original commit message:
    Introduce a new machine operator Float64Pow that for now is backed by
    the existing MathPowStub to start the unification of Math.pow, and at
    the same time address the main performance issue that TurboFan still has
    with the imaging-darkroom benchmark in Kraken.

    Also migrate the Math.pow builtin itself to a TurboFan builtin and
    remove a few hundred lines of hand-written platform code for special
    handling of the fullcodegen Math.pow version.

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

BUG=v8:3599,v8:5086,v8:5157
LOG=N

Review-Url: https://codereview.chromium.org/2106883002
Cr-Commit-Position: refs/heads/master@{#37344}

Addressing comment in https://codereview.chromium.org/2102073002/

BUG=chromium:576312, chromium:623516

Review-Url: https://codereview.chromium.org/2109713002
Cr-Commit-Position: refs/heads/master@{#37343}

Revert of [ia32] Fixes a bug in cmpw. (patchset #3 id:40001 of https://codereview.chromium.org/2103713003/ )

Reason for revert:
Causes "buildbot failure in V8 on V8 Linux gcc 4.8, Check"

Original issue's description:
> [ia32] Fixes a bug in cmpw.
>
> The opcodes for 'cmpw r/m16, r16' and 'cmpw r16, r/m16' were swapped, causing a few issues when less than/greater than comparison were performed.
>
> Adds a regression test.
>
> BUG=621926
>
> Committed: https://crrev.com/efa7095e3e360fbadbe909d831ac11b268ca26b0
> Cr-Commit-Position: refs/heads/master@{#37339}

TBR=bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=621926

Review-Url: https://codereview.chromium.org/2106913002
Cr-Commit-Position: refs/heads/master@{#37342}

BUG=

Review-Url: https://codereview.chromium.org/2101383002
Cr-Commit-Position: refs/heads/master@{#37341}

PERFORMANCE_DEFAULT mode.

BUG=

Review-Url: https://codereview.chromium.org/2108503003
Cr-Commit-Position: refs/heads/master@{#37340}

The opcodes for 'cmpw r/m16, r16' and 'cmpw r16, r/m16' were swapped, causing a few issues when less than/greater than comparison were performed.

Adds a regression test.

BUG=621926

Review-Url: https://codereview.chromium.org/2103713003
Cr-Commit-Position: refs/heads/master@{#37339}

  - GrowMemory runtime function, tests added to checks if memory can be grown
  and relocation information is updated correctly

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

Review-Url: https://codereview.chromium.org/2051043002
Cr-Commit-Position: refs/heads/master@{#37338}

Following the existing model where most committers are top-level OWNERS, this enables easier boilerplate changes to the V8 build environment and tests in the PST time-zone.

R=danno@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2101423002
Cr-Commit-Position: refs/heads/master@{#37337}

The serializer does not support serialization of HashTables in general because
after deserialization it might be necessary to rehash the table.
However the UnseededNumberDictionary does not require rehashing and this CL allows
them to be serialized.

This CL also changes the shape of UnseededNumberDictionary: the details field is
no longer part of the entry since no one needs it.

BUG=chromium:576312, chromium:623516

Review-Url: https://codereview.chromium.org/2102073002
Cr-Commit-Position: refs/heads/master@{#37336}

When re-scoping arrow function parameter initializers, temporaries
should be moved from the closure of the old scope to the closure of
the new scope, if necessary.

R=adamk@chromium.org, rossberg@chromium.org
BUG=chromium:622663
LOG=N

Review-Url: https://codereview.chromium.org/2083083007
Cr-Commit-Position: refs/heads/master@{#37335}

This part of the snapshot API should not be in use yet, so we can still
change this. The motivation for this change is:
- Use MaybeHandle where reasonable.
- Remove ambiguity: when we use index to create context from snapshot,
  we should not have a silent fallback if snapshot is not available.
- Symmetry: rename to Context::FromSnapshot to mirror templates.

R=jochen@chromium.org
BUG=chromium:617892

Review-Url: https://codereview.chromium.org/2100073002
Cr-Commit-Position: refs/heads/master@{#37334}

This cl fixes the long-standing bug for for-in with shadowing properties.

BUG=v8:705

Review-Url: https://codereview.chromium.org/2081733002
Cr-Commit-Position: refs/heads/master@{#37333}

Port d61a5c37

Original commit message:

    As a first step I uncommit the memory on the main thread. Also
    to measure impact and stability of that optimization. In a
    follow-up CL, the uncommitting should be moved on the concurrent thread.

R=jochen@chromium.org, hpayer@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/2041233003
Cr-Commit-Position: refs/heads/master@{#37332}

This avoids forgetting to add files for either gyp or gn.

While for most executables, this is detected by compilation
errors, for test executables, it can lead to tests silently
not running.

BUG=chromium:474921

Review-Url: https://codereview.chromium.org/2098313002
Cr-Commit-Position: refs/heads/master@{#37331}

It also dereferences the inputs of StoreField, if those were
CheckTaggedPointers. Tested manually.

BUG=

Review-Url: https://codereview.chromium.org/2104893002
Cr-Commit-Position: refs/heads/master@{#37330}

We use CheckNumber to guard values as being proper numbers, i.e. if the
input value is anything but a Number, we deoptimize. This follows the
existing effect/control linearization magic that we already use for the
other checks.

R=jarin@chromium.org
BUG=v8:5141

Review-Url: https://codereview.chromium.org/2109623002
Cr-Commit-Position: refs/heads/master@{#37329}

BUG=chromium:621147
LOG=N
R=ishell@chromium.org,cbruni@chromium.org

Review-Url: https://codereview.chromium.org/2100313002
Cr-Commit-Position: refs/heads/master@{#37328}

    Adding link option -bbigtoc to fix TOC overflow error.
    The option instructs the linker to generate TOC larger
    than 64k.

    TOC: http://www.ibm.com/developerworks/rational/library/overview-toc-aix/

R=machenbach@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/2107513002
Cr-Commit-Position: refs/heads/master@{#37327}

BUG=chromium:623912

Review-Url: https://codereview.chromium.org/2109603002
Cr-Commit-Position: refs/heads/master@{#37326}

The reason for reverting is: This breaks gc-stress bot:
https://chromegw.corp.google.com/i/client.v8/builders/V8%20Linux64%20GC%20Stress%20-%20custom%20snapshot

Abortion of compaction could cause duplicate entries in the typed-old-to-new remembered set. These duplicates could cause a DCHECK to trigger which checks that slots recorded in the remembered set never point to to-space. This reland-CL allows duplicates in the remembered set by removing the DCHECK, and additionally clears entries in the remembered set if objects are moved.

Original issue's description:

Cells were needed originally because there was no typed remembered set to
record direct pointers from code space to new space. A previous
CL (https://codereview.chromium.org/2003553002/) already introduced
the remembered set, this CL uses it.

This CL
* stores direct pointers in code objects, even if the target is in new space,
* records the slot of the pointer in typed-old-to-new remembered set,
* adds a list which stores weak code-to-new-space references,
* adds a test to test-heap.cc for weak code-to-new-space references,
* removes prints in tail-call-megatest.js

Review-Url: https://codereview.chromium.org/2097023002
Cr-Commit-Position: refs/heads/master@{#37325}

    Testcase big-array-literal fails with stack overflow error on ppc64,
    increasing stack-size to 1100 resolves the issue, but causes
    other platforms to fail ( https://codereview.chromium.org/2072533002/ ).
    For now, disabling the testcase on ppc64.

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

BUG=
LOG=N
NOTRY=true

Review-Url: https://codereview.chromium.org/2098413002
Cr-Commit-Position: refs/heads/master@{#37324}

Introduce a new machine operator Float64Pow that for now is backed by
the existing MathPowStub to start the unification of Math.pow, and at
the same time address the main performance issue that TurboFan still has
with the imaging-darkroom benchmark in Kraken.

Also migrate the Math.pow builtin itself to a TurboFan builtin and
remove a few hundred lines of hand-written platform code for special
handling of the fullcodegen Math.pow version.

BUG=v8:3599,v8:5086,v8:5157

Review-Url: https://codereview.chromium.org/2103733003
Cr-Commit-Position: refs/heads/master@{#37323}

The ARM64 instruction selector can generate code like this

  negs w0, w1
  b.vs deopt

but then reference the old value of w0 in the frame state, which will
obviously lead to wrong results.

R=jarin@chromium.org
BUG=v8:5158

Review-Url: https://codereview.chromium.org/2103793002
Cr-Commit-Position: refs/heads/master@{#37322}

Simplify bytecode array writing and remove some now unused bytecode traits
definitions.

BUG=v8:4280
LOG=N

Review-Url: https://codereview.chromium.org/2100793003
Cr-Commit-Position: refs/heads/master@{#37321}

  port 1b4e0130(r37181)

  original commit message:
  Previously only stubs built in the snapshot were checked for having an
  eager frame. This caused a regression to creap in on ia32 for
  RegExpConstructResultStub. Change test to always check.

BUG=

Review-Url: https://codereview.chromium.org/2098303003
Cr-Commit-Position: refs/heads/master@{#37320}

X87: [builtins] NonNumberToNumber and StringToNumber now use CallRuntime instead of TailCallRuntime.

  port b5c69cbf (r37132)

  original commit message:
  With the tail call, pointers to the JS heap could be pushed on a
  js-to-wasm frame. On the js-to-wasm frame, however, this pointer would
  not be updated by the GC.

BUG=

Review-Url: https://codereview.chromium.org/2108543002
Cr-Commit-Position: refs/heads/master@{#37319}

With the current approach we only need to track using an unordered set as we can
still access the backing store pointer and length by the time we free the
backing store.

BUG=chromium:619491, chromium:611688
LOG=N
R=ulan@chromium.org

Review-Url: https://codereview.chromium.org/2107443002
Cr-Commit-Position: refs/heads/master@{#37318}

  port cbc6adc8 (r37111)

  original commit message:
  Runtime_DeclareLookupSlot is used when generating code for var and function declarations
  originating in an eval. Over time, it's accumulated quite a bit of cruft, which this CL removes:

    - With legacy const gone, lookup slots never have any property attributes.
    - There was a bit signaling that the variable was from an eval, but that was redundant since
      DeclareLookupSlot is only used for eval.
    - Some Proxy-related code didn't make sense here.

  Its name was also not terribly clear: while "LookupSlot" is used in several places, this
  particular function is only used for declaring variables and functions inside sloppy eval.
  Renamed (and split into two) to make this clear for future archeologists.

  Also added various DCHECKs to check the assumptions being made.

BUG=

Review-Url: https://codereview.chromium.org/2107663002
Cr-Commit-Position: refs/heads/master@{#37317}

R=jgruber@chromium.org

Review-Url: https://codereview.chromium.org/2107693002
Cr-Commit-Position: refs/heads/master@{#37316}

The main fix is to mark stack memory the SafeStackFrameIterator
accesses as initialied.

Drive-by: Make sure we bail out when the simulator is in the
process of updating FP/SP registers.

BUG=v8:5156

Review-Url: https://codereview.chromium.org/2104763002
Cr-Commit-Position: refs/heads/master@{#37315}

When calling the throw method on a generator suspended inside a yield*, yield*
in turn tries to call throw on its iterable.  If the iterable does not provide a
throw method, yield* must try to call the return method instead and then throw a
TypeError.  Due to a bug in our desugaring, we never threw the TypeError.

R=adamk@chromium.org
BUG=v8:5132

Review-Url: https://codereview.chromium.org/2094253002
Cr-Commit-Position: refs/heads/master@{#37314}

  port c87168bc (r37087)

  original commit message:
  Import base::ieee754::tan() from fdlibm and introduce Float64Tan TurboFan
  operator based on that, similar to what we do for Float64Cos and Float64Sin.
  Rewrite Math.tan() as TurboFan builtin and use those operators to also
  inline Math.tan() into optimized TurboFan functions.

  Drive-by-fix: Kill the %_ConstructDouble intrinsics, and provide only
  the %ConstructDouble runtime entry for writing tests.

BUG=

Review-Url: https://codereview.chromium.org/2101233002
Cr-Commit-Position: refs/heads/master@{#37313}

Removing a bad test case because:
- The test case makes wrong assumptions about compilation. We now
  may run bytecode with the interpreter.
- The test exposes internal implementation details such as pc offset
  of JIT code.
- The test uses a runtime function specially written to cater to, and
  used only by this test. Being unmaintained, this runtime function
  is already returning bogus results, making this test useless.

R=jgruber@chromium.org

Review-Url: https://codereview.chromium.org/2101223002
Cr-Commit-Position: refs/heads/master@{#37312}

R=adamk@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2081733004
Cr-Commit-Position: refs/heads/master@{#37311}

When calling the return method on a generator suspended inside a yield*, yield*
in turn calls return on its iterable.  If this results in a "done" iterator,
yield* must return immediately, thus terminating the generator.  For some
reason, we didn't terminate the generator but continued right after the yield*.

R=adamk@chromium.org
BUG=v8:5131

Review-Url: https://codereview.chromium.org/2100093002
Cr-Commit-Position: refs/heads/master@{#37310}

R=bmeurer@chromium.org, jgruber@chromium.org
BUG=v8:5117

Review-Url: https://codereview.chromium.org/2095893002
Cr-Commit-Position: refs/heads/master@{#37309}

    variable hz is defined as a macro in AIX system header
    /usr/include/sys/m_param.h (as "ticks per second of the clock").
    The pre-processor replaces hz with the numeric value defined in
    system header file and therefore emits an error.
    Re-naming variable name to "iz".

R=bmeurer@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/2104483002
Cr-Commit-Position: refs/heads/master@{#37308}

  port c1d01aea (r37086)

  original commit message:
  Compilation of wasm functions happens before instantiation. Imports are linked afterwards, at instantiation time. Globals and memory are also
  allocated and then tied in via relocation at instantiation time.

  This paves the way for implementing Wasm.compile, a prerequisite to
  offering the compiled code serialization feature.

  Currently, the WasmModule::Compile method just returns a fixed array
  containing the code objects. More appropriate modeling of the compiled module to come.

  Opportunistically centralized the logic on how to update memory
  references, size, and globals, since that logic is the exact same on each
  architecture, except for the actual storing of values back in the
  instruction stream.

BUG=

Review-Url: https://codereview.chromium.org/2100393003
Cr-Commit-Position: refs/heads/master@{#37307}

Add NumberAbs operator to implement an inline version of Math.abs, that
can be optimized and eliminated. We don't use any speculation here, but
for now stick to the information we can infer (this way we avoid the
inherent deopt loops that Crankshaft has around Math.abs).

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
R=jarin@chromium.org
BUG=v8:5086

Review-Url: https://codereview.chromium.org/2096403002
Cr-Commit-Position: refs/heads/master@{#37306}

Rolling v8/build to 87e063014aa0f343b15f5de495a28e5f8572bf8d

Rolling v8/tools/clang to 2ad431ac7823581e1f39c5b770704e1e1ca6cb32

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

Review-Url: https://codereview.chromium.org/2101893002
Cr-Commit-Position: refs/heads/master@{#37305}