--harmony_sloppy includes behavior to turn on sloppy mode lexical
bindings. Before this patch, it also included a way to parse let
which is likely web-incompatible (let is disallowed as an
identifier). This patch splits off the let parsing from the more
general block scoping code, so that block scoping can be developed
independently.

R=adamk
LOG=N
BUG=v8:3305

Review URL: https://codereview.chromium.org/1255013002

Cr-Commit-Position: refs/heads/master@{#29855}

In ES5, dates were supposed to default to UTC if no timezone was specified. However, this changed in ES6, which specified that dates should be in the local timezone if no timezone was specified. This CL updates our behavior to match that part of the ES6 spec.

BUG=chromium:391730, v8:4242
LOG=Y

Review URL: https://codereview.chromium.org/1229903004

Cr-Commit-Position: refs/heads/master@{#29854}

These benchmarks are not updated to the latest spec and polyfill.

R=machenbach@chromium.org

LOG=N
BUG=v8:4124

Review URL: https://codereview.chromium.org/1256693002

Cr-Commit-Position: refs/heads/master@{#29853}

 - Ensure frame_size is always set during allocation.
 - Add DCHECKs that frame_size is a valid value
 - Remove locals_count, which we don't need yet (possibly every)
 - Add a newline at the end of BytecodeArray::Dissassemble
   for each bytecode.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1254873002

Cr-Commit-Position: refs/heads/master@{#29852}

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1256793005

Cr-Commit-Position: refs/heads/master@{#29851}

BUG=chromium:???
LOG=n
R=mlippautz@chromium.org,hpayer@chromium.org

Review URL: https://codereview.chromium.org/1252333002

Cr-Commit-Position: refs/heads/master@{#29850}

Reland^2 "Enable loads and stores to global vars through property cell shortcuts installed into parent script context".

This reverts commit 362b3785.

R=ishell@chromium.org

Review URL: https://codereview.chromium.org/1254723004

Cr-Commit-Position: refs/heads/master@{#29849}

This also allows us to not always compile for debugging when debug is active.

Review URL: https://codereview.chromium.org/1258583002

Cr-Commit-Position: refs/heads/master@{#29848}

Also, generic lowering for keyed stores needs to handle the case when
there is no IC slot available (it can use the generic keyed store).

BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1252303002

Cr-Commit-Position: refs/heads/master@{#29847}

R=mstarzinger@chromium.org
BUG=chromium:513496
LOG=N

Review URL: https://codereview.chromium.org/1252323002

Cr-Commit-Position: refs/heads/master@{#29846}

R=mstarzinger@chromium.org
BUG=513474,513475,513611,513612
LOG=N

Review URL: https://codereview.chromium.org/1250423002

Cr-Commit-Position: refs/heads/master@{#29845}

Fix invalid tail calls and wrong context register.

R=ishell@chromium.org

Review URL: https://codereview.chromium.org/1257603004

Cr-Commit-Position: refs/heads/master@{#29844}

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1230753004

Cr-Commit-Position: refs/heads/master@{#29843}

BUG=v8:4320
LOG=N
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1255803004

Cr-Commit-Position: refs/heads/master@{#29842}

This function will be used later instead of HasLowAllocationRate
to decide how many pages to compact.

BUG=chromium:502247
LOG=NO

Review URL: https://codereview.chromium.org/1254603002

Cr-Commit-Position: refs/heads/master@{#29841}

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1248443003

Cr-Commit-Position: refs/heads/master@{#29840}

port d6ee366d (r29834).

original commit message:

    This is the initial round of optimizations for the
    LoadGlobalViaContextStub and StoreGlobalViaContextStub, basically
    turning them into platform code stubs to avoid the Crankshaft overhead
    in the fast case, and making the runtime interface cheaper.

BUG=

Review URL: https://codereview.chromium.org/1258513003

Cr-Commit-Position: refs/heads/master@{#29839}

port 7877c4e0 (r29814).

original commit message:

    Adds basic support for generation of interpreter bytecode handler code
    snippets. The InterpreterAssembler class exposes a set of low level,
    interpreter specific operations which can be used to build a Turbofan
    graph. The Interpreter class generates a bytecode handler snippet for
    each bytecode by assembling operations using an InterpreterAssembler.

    Currently only two simple bytecodes are supported: LoadLiteral0 and Return.

BUG=

Review URL: https://codereview.chromium.org/1256783002

Cr-Commit-Position: refs/heads/master@{#29838}

port bc8041dc (r29811).

original commit message:

    Previous to this CL, ICs used a slightly different code idiom
    to get to C++ code from generated code than runtime intrinsics,
    using an IC_Utility class that in essence provided exactly
    the same functionality as Runtime::FunctionForId, but in its
    own quirky way.

    This CL unifies the two mechanisms, folding IC_Utility
    away by making all IC entry points in C++ code, e.g. IC
    miss handlers, full-fledged runtime intrinsics. This makes
    it possible to eliminate a bunch of ad-hoc declarations and
    adapters that the IC system had to needlessly re-invent.

    As a bonus and the original reason for this yak-shave:
    IC-related C++ runtime functions are now callable from
    TurboFan.

BUG=

Review URL: https://codereview.chromium.org/1252903002

Cr-Commit-Position: refs/heads/master@{#29837}

port 3334b830 (r20813).

original commit message:

    HydrogenCodeStubs consume stack arguments via descriptor.

    All of this is controlled by the CallDescriptor. It's simply the case
    that if you specify less registers than the function arity calls for,
    the rest are assumed to be on the stack.

    Bailout handlers accept these constant stack arguments too.

BUG=

Review URL: https://codereview.chromium.org/1258553002

Cr-Commit-Position: refs/heads/master@{#29836}

Revert of Revert "In RegExp, lastIndex is read with ToLength, not ToInteger" (patchset #1 id:1 of https://codereview.chromium.org/1243053005/)

Reason for revert:
[Sheriff] This causes a breakage with custom snapshot (bisected locally):
http://build.chromium.org/p/client.v8/builders/V8%20Linux64%20GC%20Stress%20-%20custom%20snapshot/builds/1190

Original issue's description:
> Revert "In RegExp, lastIndex is read with ToLength, not ToInteger"
>
> $toLength is slow, causing a 3.8%-8% regression in the Octane RegExp
> benchmark. Reverting this patch brings it back up. To make this change,
> we'll need a faster implementation fo $toLength.
>
> BUG=chromium:513160
> LOG=Y
> R=adamk
>
> Committed: https://crrev.com/477d651c6a978bdf34954048a235895c62dab0ac
> Cr-Commit-Position: refs/heads/master@{#29830}

TBR=adamk@chromium.org,littledan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:513160

Review URL: https://codereview.chromium.org/1254723005

Cr-Commit-Position: refs/heads/master@{#29835}

This is the initial round of optimizations for the
LoadGlobalViaContextStub and StoreGlobalViaContextStub, basically
turning them into platform code stubs to avoid the Crankshaft overhead
in the fast case, and making the runtime interface cheaper.

R=ishell@chromium.org
BUG=chromium:510694
LOG=n

Review URL: https://codereview.chromium.org/1238143002

Cr-Commit-Position: refs/heads/master@{#29834}

Cr-Commit-Position: refs/heads/master@{#29833}

Cr-Commit-Position: refs/heads/master@{#29832}

port 26ffee2c (r29789).

original commit message:

    It's just the same as StoreTransitionDescriptor.

BUG=

Review URL: https://codereview.chromium.org/1253573004

Cr-Commit-Position: refs/heads/master@{#29831}

$toLength is slow, causing a 3.8%-8% regression in the Octane RegExp
benchmark. Reverting this patch brings it back up. To make this change,
we'll need a faster implementation fo $toLength.

BUG=chromium:513160
LOG=Y
R=adamk

Review URL: https://codereview.chromium.org/1243053005

Cr-Commit-Position: refs/heads/master@{#29830}

Rolling v8/tools/clang to 89e7efc0e2c12578ed7217fcf176ec1a4e567b2a

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1256733002

Cr-Commit-Position: refs/heads/master@{#29829}

port 1f295980 (r29787).

original commit message:

    This fixes a recent regression where the register holding the original
    receiver was pushed onto the stack before the internal frame within the
    CallStubInRecordCallTarget helper was created. That in turn confused
    the stack walker when allocations in these stubs failed.

BUG=

Review URL: https://codereview.chromium.org/1247493004

Cr-Commit-Position: refs/heads/master@{#29828}

BUG=chromium:513074
R=bmeurer@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1249273003

Cr-Commit-Position: refs/heads/master@{#29827}

Adding CHECKED_OUT_VERSION in test/simdjs so that
the bots don't revert and redownload each time.

LOG=N
BUG=None
TEST=None
R=littledan@chromium.org,machenbach@chromium.org

Review URL: https://codereview.chromium.org/1242863003

Cr-Commit-Position: refs/heads/master@{#29826}

Review URL: https://codereview.chromium.org/1251593009

Cr-Commit-Position: refs/heads/master@{#29825}

TBR=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1246983004 .

Cr-Commit-Position: refs/heads/master@{#29824}

Port 1f295980

Original commit message:
    This fixes a recent regression where the register holding the original
    receiver was pushed onto the stack before the internal frame within the
    CallStubInRecordCallTarget helper was created. That in turn confused
    the stack walker when allocations in these stubs failed.

R=mstarzinger@chromium.org, dstence@us.ibm.com, michael_dawson@ca.ibm.com
BUG=chromium:512711
LOG=N

Review URL: https://codereview.chromium.org/1252493004

Cr-Commit-Position: refs/heads/master@{#29823}

Port 7877c4e0

Original commit message:
    Adds basic support for generation of interpreter bytecode handler code
    snippets. The InterpreterAssembler class exposes a set of low level,
    interpreter specific operations which can be used to build a Turbofan
    graph. The Interpreter class generates a bytecode handler snippet for
    each bytecode by assembling operations using an InterpreterAssembler.

    Currently only two simple bytecodes are supported: LoadLiteral0 and Return.

R=rmcilroy@chromium.org, dstence@us.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1250723003

Cr-Commit-Position: refs/heads/master@{#29822}

Port bc8041dc

Original commit message:
    Previous to this CL, ICs used a slightly different code idiom
    to get to C++ code from generated code than runtime intrinsics,
    using an IC_Utility class that in essence provided exactly
    the same functionality as Runtime::FunctionForId, but in its
    own quirky way.

    This CL unifies the two mechanisms, folding IC_Utility
    away by making all IC entry points in C++ code, e.g. IC
    miss handlers, full-fledged runtime intrinsics. This makes
    it possible to eliminate a bunch of ad-hoc declarations and
    adapters that the IC system had to needlessly re-invent.

    As a bonus and the original reason for this yak-shave:
    IC-related C++ runtime functions are now callable from
    TurboFan.

R=danno@chromium.org, dstence@us.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1249433004

Cr-Commit-Position: refs/heads/master@{#29821}

Port 3334b830

Original commit message;
    All of this is controlled by the CallDescriptor. It's simply the case
    that if you specify less registers than the function arity calls for,
    the rest are assumed to be on the stack.

    Bailout handlers accept these constant stack arguments too.

R=mvstanton@chromium.org, dstence@us.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1256563002

Cr-Commit-Position: refs/heads/master@{#29820}

Port 26ffee2c

Original commit message:
    It's just the same as StoreTransitionDescriptor.

R=mvstanton@chromium.org, dstence@us.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1246143004

Cr-Commit-Position: refs/heads/master@{#29819}

Fix GCMole warning from r29814 (7877c4e0).

BUG=v8:4280
LOG=N
NOTREECHECKS=true
TBR=machenbach,mstarzinger

Review URL: https://codereview.chromium.org/1243893004

Cr-Commit-Position: refs/heads/master@{#29818}

This mostly removes dead code and obsolete special cases from the
RawMachineAssembler::MakeNode helper, that shouldn't be necessary
anymore.

R=rmcilroy@chromium.org

Review URL: https://codereview.chromium.org/1243253005

Cr-Commit-Position: refs/heads/master@{#29817}

According to the ECMA spec, a 24th hour is allowed if the minutes, seconds, and milliseconds are all zero (i.e. it's midnight). Previously, we parsed the date correctly, however, we failed to account in all checks for the possibility of a 24th hour. This CL changes the check to allow a 24th hour if it's exactly midnight.

BUG=chromium:174609
LOG=Y

Review URL: https://codereview.chromium.org/1240093005

Cr-Commit-Position: refs/heads/master@{#29816}