There isn't a plan to turn it on soon, so we'll take it out in favor of cleaner code.

BUG=

Review URL: https://codereview.chromium.org/1202173002

Cr-Commit-Position: refs/heads/master@{#30767}

This makes sure that the arguments object materialization in the method
prologue is composable with respect to inlining. The generic runtime
functions materializing those objects now respect the deoptimization
information when reconstructing the original arguments.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/1340313003

Cr-Commit-Position: refs/heads/master@{#30766}

Fixing floating point register clobbering for MIPSr6 (32 and 64)
due to using of f31 floating point register as double compare register,
without saving the value of the register before using it.

TEST=cctest/test-debug/*
BUG=

Review URL: https://codereview.chromium.org/1346623002

Cr-Commit-Position: refs/heads/master@{#30765}

Review URL: https://codereview.chromium.org/1348073002

Cr-Commit-Position: refs/heads/master@{#30764}

BUG=v8:4422
R=jochen@chromium.org
LOG=Y

Review URL: https://codereview.chromium.org/1346613002

Cr-Commit-Position: refs/heads/master@{#30763}

No need to rely on the %_IsConstructCall magic here, we can just
implement the Symbol constructor in C++ altogether (it was just a
stupid wrapper around %CreateSymbol anyway).

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1349643002

Cr-Commit-Position: refs/heads/master@{#30762}

This adds debug code that makes sure that the runtime functions that
materialize arguments objects, {Runtime_New[Sloppy|Strict]Arguments},
are not being called from within an inlined scope. They would produce
wrong results and we should avoid producing code that does this.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1343763002

Cr-Commit-Position: refs/heads/master@{#30761}

Adds concurrency support for:
- MemoryChunk: Fragmentation counters
- MemoryChunk: High-water mark
- MemoryAllocator: Lowest and highest ever allocated addresses, size, and
  capacity

R=hpayer@chromium.org
BUG=chromium:524425
LOG=N

This reverts commit 0db34dbe.

BUG=

Review URL: https://codereview.chromium.org/1346973002

Cr-Commit-Position: refs/heads/master@{#30760}

Implement the String constructor completely as native builtin,
avoiding the need to do gymnastics in JavaScript builtin to
properly detect the no argument case (which is different from
the undefined argument case) and also allowing to just
tailcall through to ToString or SymbolDescriptiveString for
the common case. Also the JavaScript builtin was misleading
since the case for construct call was unused, but could be
triggered in a wrong way once we support tail calls from
constructor functions.

This refactoring allows us to properly implement subclassing
for String builtins, once we have the correct initial_map on
derived classes (it's merely a matter of using NewTarget
instead of the target register now).

This introduces a new %SymbolDescriptiveString runtime
entry, which is also used by Symbol.toString() now.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1344893002

Cr-Commit-Position: refs/heads/master@{#30759}

BUG=v8:4423
LOG=N

Review URL: https://codereview.chromium.org/1342013003

Cr-Commit-Position: refs/heads/master@{#30758}

R=hpayer@chromium.org
BUG=
NOTRY=true

Review URL: https://codereview.chromium.org/1350633003

Cr-Commit-Position: refs/heads/master@{#30757}

Same as https://codereview.chromium.org/1340303002/

BUG=

Review URL: https://codereview.chromium.org/1339763005

Cr-Commit-Position: refs/heads/master@{#30756}

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1318713007

Cr-Commit-Position: refs/heads/master@{#30755}

Mark ArrayLiterals utilizing the spread operator as non-simple.
This causes them to return false for IsCompileTimeValue, and thus
causes spread to work as expected in nested literals.

BUG=v8:4417
LOG=y

Review URL: https://codereview.chromium.org/1336123002

Cr-Commit-Position: refs/heads/master@{#30754}

Review URL: https://codereview.chromium.org/1340303002

Cr-Commit-Position: refs/heads/master@{#30753}

Revert of [heap] Concurrency support for heap book-keeping info (patchset #4 id:60001 of https://codereview.chromium.org/1340923004/ )

Reason for revert:
crashing: http://build.chromium.org/p/client.v8/builders/V8%20Win32%20-%20debug%20-%203/builds/4716

Original issue's description:
> [heap] Concurrency support for heap book-keeping info.
>
> Adds concurrency support for:
> - MemoryChunk: Fragmentation counters
> - MemoryChunk: High-water mark
> - MemoryAllocator: Lowest and highest ever allocated addresses, size, and
>   capacity
>
> R=hpayer@chromium.org
> BUG=chromium:524425
> LOG=N
>
> Committed: https://crrev.com/63190721cda4966e01d71e92a730ce48ea789fbc
> Cr-Commit-Position: refs/heads/master@{#30749}

TBR=hpayer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:524425

Review URL: https://codereview.chromium.org/1340323002

Cr-Commit-Position: refs/heads/master@{#30752}

Loads get an acquire, store/cas a release. Increment gets a full barrier.

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1343883004

Cr-Commit-Position: refs/heads/master@{#30751}

The ES6 specification says that "Built-in functions that are ECMAScript
function objects must be strict mode functions", which in particular
means that you can never test for them using the "caller" field of a
sloppy mode function.

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux_layout_dbg,v8_linux_nosnap_dbg
R=mstarzinger@chromium.org
BUG=v8:105
LOG=n

Review URL: https://codereview.chromium.org/1347663002

Cr-Commit-Position: refs/heads/master@{#30750}

Adds concurrency support for:
- MemoryChunk: Fragmentation counters
- MemoryChunk: High-water mark
- MemoryAllocator: Lowest and highest ever allocated addresses, size, and
  capacity

R=hpayer@chromium.org
BUG=chromium:524425
LOG=N

Review URL: https://codereview.chromium.org/1340923004

Cr-Commit-Position: refs/heads/master@{#30749}

Previously the mutex only guarded free_list_. The extension covers also
allocation_list_.

BUG=chromium:524425
LOG=N

Review URL: https://codereview.chromium.org/1341293002

Cr-Commit-Position: refs/heads/master@{#30748}

Move the implementation of the Abstract Equality Comparison to the
runtime and thereby remove the EQUALS dispatcher builtin. Also remove
the various runtime entry points that were only used to support the
EQUALS builtin.

Now the Abstract Equality Comparison is also using the correct
ToPrimitive implementation, which properly supports @@toPrimitive.

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux_layout_dbg,v8_linux_nosnap_dbg
R=mstarzinger@chromium.org
BUG=v8:4307
LOG=n

Review URL: https://codereview.chromium.org/1337993005

Cr-Commit-Position: refs/heads/master@{#30747}

BUG=

Review URL: https://codereview.chromium.org/1343043002

Cr-Commit-Position: refs/heads/master@{#30746}

port e7fb2339 (r30710).

original commit message:

    Adds support for JS calls to the interpreter. In order to support
    calls from the interpreter, the PushArgsAndCall builtin is added
    which pushes a sequence of arguments onto the stack and calls
    builtin::Call.

    Adds the Call bytecode.

BUG=

Review URL: https://codereview.chromium.org/1334153004

Cr-Commit-Position: refs/heads/master@{#30745}

port eadfd666 (r30706).

original commit message:

    The String constructor was somewhat complex with a lot of micro
    optimizations that are not relevant or even misguided. It would be
    really hard to port that code to ES6, which requires String to be
    subclassable. So as a first step we reduced the necessary complexity
    to the bare minimum (also removing the last user of the fairly complex
    MacroAssembler::LookupNumberStringCache method).

    This also removes the counters for the String constructor, which
    were not properly exposed anymore (and not kept in sync with inlined
    versions of the String constructor anyway).

BUG=

Review URL: https://codereview.chromium.org/1336133003

Cr-Commit-Position: refs/heads/master@{#30744}

port 9fc4fc14 (r30695).

BUG=

Review URL: https://codereview.chromium.org/1339293002

Cr-Commit-Position: refs/heads/master@{#30743}

R=hpayer@chromium.org
BUG=chromium:524425
LOG=N

Review URL: https://codereview.chromium.org/1340253004

Cr-Commit-Position: refs/heads/master@{#30742}

port 39604dda (r30693).

original commit message:

    Just use a %ThrowStackOverflow runtime function instead, which
    does the trick, especially since the Isolate already has a
    preallocated StackOverflow error for that.

BUG=

Review URL: https://codereview.chromium.org/1344793002

Cr-Commit-Position: refs/heads/master@{#30741}

port 622fa0ea (r30691).

original commit message:

    Currently we do this dance between the CallConstructStub, the
    CALL_* builtins and the %GetConstructorDelegate, %GetProxyTrap,
    and %Apply runtime functions for every [[Construct]] operation on
    non-function callables. This is complexity is unnecessary, and can
    be simplified to work without any JS builtin. This will also make it
    a lot easier to implement ES6 compliant [[Construct]] for proxies.

    Also sanitize the invariant for CallConstructStub, which up until now
    always restored the context itself, but that force us to always create
    another copy of all arguments in case of proxies and other callables,
    so we can relax that constraint by making the caller restore the context
    (this only affects fullcodegen, since the optimizing compilers already
    properly restore the context anyway).

BUG=

Review URL: https://codereview.chromium.org/1341233002

Cr-Commit-Position: refs/heads/master@{#30740}

X87: Vector ICs: The Oracle needs to report feedback for the object literals and the count operation.

port 752b0308 (r30686).

original commit message:

    The refactoring is because it's awkward and error-prone to deterimine which IC slot an
    ObjectLiteralProperty uses for feedback. The fix is for each one to know it's own slot. In the
    numbering pass, we allocate slots for the ObjectLiteral, then hand out those slots into the
    properties.

    It adds one word to the ObjectLiteralProperty expression - I'm investigating if thats a
    problem.

    This changes makes compiling the object literal cleaner across the three compilers. Also, the
    slot allocation logic in ObjectLiteral::ComputeFeedbackRequirements() was refactoring to mimic
    the style in full-codegen. This is useful since it must remain in sync with
    FullCodegen::VisitObjectLiteral().

BUG=

Review URL: https://codereview.chromium.org/1341223002

Cr-Commit-Position: refs/heads/master@{#30739}

The assumption that every function body produces a value does not hold
for functions that e.g. unconditionally throw or endlessly loop. This
fixes the inlining logic to handle such cases.

R=bmeurer@chromium.org
TEST=mjsunit/regress/regress-crbug-530598
BUG=chromium:530598
LOG=n

Review URL: https://codereview.chromium.org/1333193005

Cr-Commit-Position: refs/heads/master@{#30738}

(reason for revert/reland: patch incorrectly left --vector-stores flag
 on, helpfully revealing some gcstress issues to look at, but they
 don't need to block this CL).

Some pretty hacky code was used to carry out the tail-call
handler dispatch on ia32 vector stores due to a lack
of free registers. It really tanks performance. A better
approach is to use a virtual register on the isolate.

BUG=
TBR=jkummerow@chromium.org, vogelheim@chromium.org

Review URL: https://codereview.chromium.org/1346573002

Cr-Commit-Position: refs/heads/master@{#30737}

Returning a result array with holey elements kind in where we actually have a packed kind causes performance regressions.

LOG=N
BUG=chromium:531357

Review URL: https://codereview.chromium.org/1340033002

Cr-Commit-Position: refs/heads/master@{#30736}

This models the materialization of arguments objects in the prologue
within the IR graph. It will in turn allow us to optimize access to
these objects and also correctly handle them with inlining.

R=bmeurer@chromium.org,mvstanton@chromium.org
TEST=cctest/test-run-jsobjects/Arguments*

Review URL: https://codereview.chromium.org/1344553003

Cr-Commit-Position: refs/heads/master@{#30735}

BUG=chromium:515782
LOG=n

Review URL: https://codereview.chromium.org/1333133003

Cr-Commit-Position: refs/heads/master@{#30734}

The conditionals were added to facilitate a two-sided build GN config update
where the default optimization config was renamed. This is complete so the
transitional code can be removed.

Review URL: https://codereview.chromium.org/1338163003

Cr-Commit-Position: refs/heads/master@{#30733}

Reported by Bruce Dawson.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1346453002

Cr-Commit-Position: refs/heads/master@{#30732}

NOTRY=true

Review URL: https://codereview.chromium.org/1341213002

Cr-Commit-Position: refs/heads/master@{#30731}

I noticed after reading a few GitHub comments that the information
about contributing to V8 is hard to find. I think it makes sense
to add this information to the README.

NOTRY=true
R=jochen@chromium.org, seththompson@chromium.org
LOG=N

Review URL: https://codereview.chromium.org/1342803004

Cr-Commit-Position: refs/heads/master@{#30730}

Remove incorrect usage of callee-saved FPU regs (f20 and above).
Also remove unnecessary push/pop which were occasionally unpaired,
and caused crash.

TEST=cctest/test-assembler-mips[64]
BUG=

Review URL: https://codereview.chromium.org/1338713004

Cr-Commit-Position: refs/heads/master@{#30729}

R=jarin
BUG=

Review URL: https://codereview.chromium.org/1340023003

Cr-Commit-Position: refs/heads/master@{#30728}