This change improves performance for the common case of
Object.getOwnPropertyDescriptor by up 3x-4x, where we just
return a property descriptor object for a regular data or
accessor property.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1607943003

Cr-Commit-Position: refs/heads/master@{#33398}

Rolling v8/tools/clang to 9c45873bbb82dc33f5f88f5c7dbc06ee9ecc7e8f

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

Review URL: https://codereview.chromium.org/1610483002

Cr-Commit-Position: refs/heads/master@{#33397}

The old handling of escaped keywords erroneously treated escaped versions
of "let" and "static" as ESCAPED_KEYWORD, leading to erroneous errors in
sloppy mode. Moreover, though the class literal parsing code attempted
to fix up the parsing of escaped versions of "static" to allow it in the
right places, that code wasn't complete.

Fixing the scanner to mark escaped "static" as ESCAPED_STRICT_RESERVED_WORD
allows simplifying the class literal parsing code. A little extra code
was needed to properly handle the new treatment of escaped "let".

Note that "yield" is still broken (that is, we're overly restrictive of
escaped "yield" in sloppy mode).

Review URL: https://codereview.chromium.org/1602013007

Cr-Commit-Position: refs/heads/master@{#33396}

The dust has settled and it can now be used like any other header file

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1605973002

Cr-Commit-Position: refs/heads/master@{#33395}

Revert of Tenure descriptor arrays. (patchset #1 id:1 of https://codereview.chromium.org/1526663002/ )

Reason for revert:
Regresses memory consumption.

BUG=571180,571657
LOG=n

Original issue's description:
> Tenure descriptor arrays.
>
> BUG=
>
> Committed: https://crrev.com/74bc69166de8cfb967e79b5c8cc31c2a76490dc8
> Cr-Commit-Position: refs/heads/master@{#32846}

TBR=ishell@chromium.org,ulan@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.

Review URL: https://codereview.chromium.org/1606003002

Cr-Commit-Position: refs/heads/master@{#33394}

This patch implements one aspect of ES2015 RegExp subclassing:
String.prototype.replace is separated into two parts, a method on
RegExp.prototype in case the first argument is a RegExp, and the
String.prototype.replace method, which handles the string pattern
case. This separation is described in the ES2015 specification.
Most of the patch is simply moving code from string.js to regexp.js.

R=yangguo
LOG=Y
BUG=v8:4343

Review URL: https://codereview.chromium.org/1590673002

Cr-Commit-Position: refs/heads/master@{#33393}

Port fc53eed1

Original commit message:
    The new operator converts a float32 input to int32 through truncation.

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

Review URL: https://codereview.chromium.org/1593333006

Cr-Commit-Position: refs/heads/master@{#33392}

BUG=chromium:535160
LOG=n
TBR=tandrii@chromium.org

Review URL: https://codereview.chromium.org/1607503002

Cr-Commit-Position: refs/heads/master@{#33391}

BUG=

Review URL: https://codereview.chromium.org/1608933003

Cr-Commit-Position: refs/heads/master@{#33390}

o Adds wide variants of bytecodes that have operands describing ranges
  of registers. The upcoming wide register support does not suppport
  re-mapping ranges.
o Adds kRegPair16 and kRegTriple16 operands required for new wide
  bytecodes and renames Count8/Count16 operands to RegCount8/RegCount16.
o Removes Exchange bytecodes

BUG=v8:4675
LOG=NO

Review URL: https://codereview.chromium.org/1595103006

Cr-Commit-Position: refs/heads/master@{#33389}

Fixes a bug where the context would be popped before labeled block break target
location.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1601153002

Cr-Commit-Position: refs/heads/master@{#33388}

Newly added tests cctest/test-run-wasm-js/Run_JSSelect_0...6 cause failures
on MIPS bigendian and are skipped until a solution is found.

BUG=

Review URL: https://codereview.chromium.org/1608813003

Cr-Commit-Position: refs/heads/master@{#33387}

This is the ia32/x64 version of https://codereview.chromium.org/873703002,
which fixed the same problem on arm/arm64.

BUG=chromium:553441
LOG=n
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1604913002

Cr-Commit-Position: refs/heads/master@{#33386}

After 1564083002, spread expressions are desugared and should not
survive in the AST after parsing. This patch removes dead code
related to this.  It also eliminates the kSpread bailout reason
and the concat_iterable_to_array_builtin.

R=bmeurer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1592713002

Cr-Commit-Position: refs/heads/master@{#33385}

Now that we support eval in Ignition, remove the fallback for eval checks
and make the flag only fallback on catch blocks.

BUG=v8:4280,v8:4676
LOG=N

Review URL: https://codereview.chromium.org/1595223004

Cr-Commit-Position: refs/heads/master@{#33384}

Automate ALL the repetitive workflows!

Drive-by: fix 'interpreter' watchlist definition.

NOTRY=true

Review URL: https://codereview.chromium.org/1589633007

Cr-Commit-Position: refs/heads/master@{#33383}

This reverts commit 7cf64f40.

Tanks octane. Will use a different approach here.

BUG=chromium:578871, chromium:524425
LOG=N
TBR=hpayer@chromium.org

Review URL: https://codereview.chromium.org/1605813004

Cr-Commit-Position: refs/heads/master@{#33382}

R=ahaas@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1604603002

Cr-Commit-Position: refs/heads/master@{#33381}

The Object.getOwnPropertyNames method always calls into C++ anyway,
so there's no point in having the JavaScript wrapper around at all.

Drive-by-fix: Inline GetOwnEnumerablePropertyNames into its single
call site.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1605803002

Cr-Commit-Position: refs/heads/master@{#33380}

The implementation of Object.getOwnPropertyDescriptor always called into
C++ anyway, so there's no need to have this JavaScript wrapper around at
all.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1606783002

Cr-Commit-Position: refs/heads/master@{#33379}

Rolling v8/tools/clang to c3b604840a63c06fa1c0c652119860e97fd57abe

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

Review URL: https://codereview.chromium.org/1601523006

Cr-Commit-Position: refs/heads/master@{#33378}

The old mechanism was a left-over from a previous time where the runtime
would rely on the presence or absence of the setter to figure out
whether or not the property is mutable. This is unnecessary by now.

Review URL: https://codereview.chromium.org/1600923002

Cr-Commit-Position: refs/heads/master@{#33377}

Previously MakeModuleExport invalidly set "all-can-*" to true. Also module export setters need to throw (in strict-mode) according to ES6 9.4.6.6 and 9.4.6.9.

BUG=

Review URL: https://codereview.chromium.org/1602753002

Cr-Commit-Position: refs/heads/master@{#33376}

R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1603683002 .

Cr-Commit-Position: refs/heads/master@{#33375}

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

Review URL: https://codereview.chromium.org/1601843002

Cr-Commit-Position: refs/heads/master@{#33374}

This adds a handler table field to the header of our BytecodeArray
objects. The field will eventually hold a range-based handler table
similar to full-codegen code, to support exception handlong within
interpreted code.

R=oth@chromium.org
BUG=v8:4674
LOG=n

Review URL: https://codereview.chromium.org/1606493002

Cr-Commit-Position: refs/heads/master@{#33373}

LOG=Y
BUG=chromium:575167

Review URL: https://codereview.chromium.org/1576953002

Cr-Commit-Position: refs/heads/master@{#33372}

VisitObjectLiteral has two parts. First it creates a literal and then
sets properties or accessor properties. Setting properties requires a
runtime call and it expects the literal object which was created in the
first part is contiguous with other registers it allocates. Since these
are allocated in a different scope they are not always contiguous.
This causes problems with mjsunit/setter-on-constructor-prototype.js.
This cl fixes by allocating contiguous registers in the inner scope.
Literal value is copied into the newly allocated register so that all
the required registers are always contiguous.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1588903002

Cr-Commit-Position: refs/heads/master@{#33371}

R=ahaas@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1608543002 .

Cr-Commit-Position: refs/heads/master@{#33370}

Revert of [turbofan] Implement rounding of floats on x64 and ia32 without sse4.1. (patchset #2 id:20001 of https://codereview.chromium.org/1584663007/ )

Reason for revert:
Code is incorrect for -0.

Original issue's description:
> [turbofan] Implement rounding of floats on x64 and ia32 without sse4.1.
>
> The implementation sets the rounding mode flag and then uses the
> cvtsd2si and cvtsi2sd instructions (convert between float and int) to do
> the rounding. Input values outside int range either don't have to be
> rounded anyways, or are rounded by calculating input + 2^52 - 2^52 for
> positive inputs, or input -2^52 + 2^52 for negative inputs. The original
> rounding mode is restored afterwards.
>
> R=titzer@chromium.org
>
> B=575379
>
> Committed: https://crrev.com/fa5d09e547abe79a8c82f780deb980c53ad78beb
> Cr-Commit-Position: refs/heads/master@{#33367}

TBR=titzer@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/1593313010

Cr-Commit-Position: refs/heads/master@{#33369}

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1601743002

Cr-Commit-Position: refs/heads/master@{#33368}

The implementation sets the rounding mode flag and then uses the
cvtsd2si and cvtsi2sd instructions (convert between float and int) to do
the rounding. Input values outside int range either don't have to be
rounded anyways, or are rounded by calculating input + 2^52 - 2^52 for
positive inputs, or input -2^52 + 2^52 for negative inputs. The original
rounding mode is restored afterwards.

R=titzer@chromium.org

B=575379

Review URL: https://codereview.chromium.org/1584663007

Cr-Commit-Position: refs/heads/master@{#33367}

R=bradnelson@chromium.org, ahaas@chromium.org
LOG=Y
BUG=chromium:575372

Review URL: https://codereview.chromium.org/1573213002

Cr-Commit-Position: refs/heads/master@{#33366}

This became temporarily a big issue, because spreads are desugared
into do-expressions.  This patch fixes the problem with having
spreads as parameter initializers in arrow expressions, e.g., this
line would crash:

    [], ((x = [...[42]]) => x)();

R=rossberg@chromium.org
BUG=chromium:578038
LOG=N

Review URL: https://codereview.chromium.org/1581403007

Cr-Commit-Position: refs/heads/master@{#33365}

Review URL: https://codereview.chromium.org/1600353003

Cr-Commit-Position: refs/heads/master@{#33364}

In many places we over-specify runtime-calls by explicitly mentioning
again the argument count. Except for var-args runtime-functions we can
easily deduce this from the parameters in runtime.h.

BUG=

Review URL: https://codereview.chromium.org/1596293003

Cr-Commit-Position: refs/heads/master@{#33363}

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

Review URL: https://codereview.chromium.org/1603533002

Cr-Commit-Position: refs/heads/master@{#33362}

BUG=

Review URL: https://codereview.chromium.org/1593713002

Cr-Commit-Position: refs/heads/master@{#33361}

BUG=v8:4163,v8:4630
LOG=y

R=rossberg

Review URL: https://codereview.chromium.org/1590873002

Cr-Commit-Position: refs/heads/master@{#33360}

Proxy.

If a constructable Proxy changes the target's prototype during the
prototype lookup the target's initial map stays uninitialized half-way
during object construction.

LOG=n
BUG=chromium:578039

Review URL: https://codereview.chromium.org/1586203003

Cr-Commit-Position: refs/heads/master@{#33359}