Contribution of PowerPC port (continuation of 422063005, 817143002 and 866843003)
This patch brings the ppc directories up to date with our repo. We have
removed 5 individual optimizations which require changes in both the ppc and common
directories so they can be more easily reviewed on their own in subsequent patches.

Subsequent patches will cover:
- individual optimizations for PPC (5)
- remaining AIX changes not resolved by 4.8 compiler (4.8 is only recently available
for AIX)
- incremental updates required to ppc directories due to platform specific changes
made in google repos while we complete the above steps.

With the update there are still some timeouts seen when run in simulated mode which
may be a result of the missing optimizations.  Once we have the optimizations in
we will review the simulation results and address/exclude tests as necessary so that
the simulated runs are clean.

	new file:   src/compiler/ppc/code-generator-ppc.cc
	new file:   src/compiler/ppc/instruction-codes-ppc.h
	new file:   src/compiler/ppc/instruction-selector-ppc.cc
	new file:   src/compiler/ppc/linkage-ppc.cc
	modified:   src/ic/ppc/handler-compiler-ppc.cc
	modified:   src/ic/ppc/ic-compiler-ppc.cc
	modified:   src/ic/ppc/ic-ppc.cc
	modified:   src/ic/ppc/stub-cache-ppc.cc
	modified:   src/ppc/assembler-ppc.cc
	modified:   src/ppc/assembler-ppc.h
	modified:   src/ppc/builtins-ppc.cc
	modified:   src/ppc/code-stubs-ppc.cc
	modified:   src/ppc/code-stubs-ppc.h
	modified:   src/ppc/codegen-ppc.cc
	modified:   src/ppc/constants-ppc.h
	modified:   src/ppc/deoptimizer-ppc.cc
	modified:   src/ppc/disasm-ppc.cc
	modified:   src/ppc/full-codegen-ppc.cc
	modified:   src/ppc/interface-descriptors-ppc.cc
	modified:   src/ppc/lithium-codegen-ppc.cc
	modified:   src/ppc/lithium-codegen-ppc.h
	modified:   src/ppc/lithium-ppc.cc
	modified:   src/ppc/lithium-ppc.h
	modified:   src/ppc/macro-assembler-ppc.cc
	modified:   src/ppc/macro-assembler-ppc.h
	modified:   src/ppc/regexp-macro-assembler-ppc.cc
	modified:   src/ppc/regexp-macro-assembler-ppc.h
	modified:   src/ppc/simulator-ppc.cc
	modified:   src/ppc/simulator-ppc.h
	new file:   test/unittests/compiler/ppc/instruction-selector-ppc-unittest.cc

R=danno@chromium.org, svenpanne@chromium.org

BUG=

Review URL: https://codereview.chromium.org/901083004

Cr-Commit-Position: refs/heads/master@{#26471}

Port 9e086506

TEST=cctest/test-run-jscalls/ReceiverPatching
BUG=

Review URL: https://codereview.chromium.org/904663003

Cr-Commit-Position: refs/heads/master@{#26470}

BUG=
R=paul.lind@imgtec.com

Review URL: https://codereview.chromium.org/905493002

Cr-Commit-Position: refs/heads/master@{#26469}

BUG=

Review URL: https://codereview.chromium.org/879693004

Cr-Commit-Position: refs/heads/master@{#26468}

Port 634b0f20

BUG=

Review URL: https://codereview.chromium.org/900253002

Cr-Commit-Position: refs/heads/master@{#26467}

R=rossberg@chromium.org
BUG=chromium:452510
LOG=Y

Review URL: https://codereview.chromium.org/893993007

Cr-Commit-Position: refs/heads/master@{#26466}

BUG=

Review URL: https://codereview.chromium.org/905473003

Cr-Commit-Position: refs/heads/master@{#26465}

Looking up and passing this argument is unnecessary.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/898013003

Cr-Commit-Position: refs/heads/master@{#26464}

1) The hardcoded strings were converted into DeoptReason enum.

2) Deopt comment were converted into a pair location and deopt reason entries so
the deopt reason tracking mode would less affect the size of the RelocInfo table and heap.

3) DeoptReason entry in RelocInfo reuses kCommentTag value and generates short entry in RelocInfo table.

BUG=452067
LOG=n

Committed: https://crrev.com/c49820e45b57f128a98690940875c049f612dde6
Cr-Commit-Position: refs/heads/master@{#26434}

Committed: https://crrev.com/ec42e002da03adb2db968dd5b7453341ddc59a5c
Cr-Commit-Position: refs/heads/master@{#26448}

Review URL: https://codereview.chromium.org/874323003

Cr-Commit-Position: refs/heads/master@{#26463}

Review URL: https://codereview.chromium.org/884163004

Cr-Commit-Position: refs/heads/master@{#26462}

This way we can ship \u{..} escapes in strings / identifiers before shipping /u
regexps.

BUG=

Review URL: https://codereview.chromium.org/903703002

Cr-Commit-Position: refs/heads/master@{#26461}

It doesn't do anything for now, but it implies strict mode. Added tests to
test-parsing.cc to test that.

BUG=

Review URL: https://codereview.chromium.org/898983002

Cr-Commit-Position: refs/heads/master@{#26460}

Make sure the initial graph is fully populated with source position information and automatically propagate that information down through newly allocated nodes during reduction passes in the most unobtrusive way that's currently possible.

Review URL: https://codereview.chromium.org/897883002

Cr-Commit-Position: refs/heads/master@{#26459}

R=jarin@chromium.org
TEST=mjsunit/regress/regress-crbug-455644
BUG=chromium:455644
LOG=N

Review URL: https://codereview.chromium.org/880443004

Cr-Commit-Position: refs/heads/master@{#26458}

Revert of Externalize deoptimization reasons. (patchset #7 id:120001 of https://codereview.chromium.org/874323003/)

Reason for revert:
This CL breaks RelocInfo::INTERNAL_REFERENCE (and maybe others that come after DEOPT_REASON), which is currently (mostly) unused on tip-of-tree, but will be used for jump tables soon(ish) and should therefore work. It seems to be a problem with implicitly assumptions about the number of reloc info modes. Needs further investigation.

Original issue's description:
> Externalize deoptimization reasons.
>
> 1) The hardcoded strings were converted into DeoptReason enum.
>
> 2) Deopt comment were converted into a pair location and deopt reason entries so
> the deopt reason tracking mode would less affect the size of the RelocInfo table and heap.
>
> 3) DeoptReason entry in RelocInfo reuses kCommentTag value and generates short entry in RelocInfo table.
>
> BUG=452067
> LOG=n
>
> Committed: https://crrev.com/c49820e45b57f128a98690940875c049f612dde6
> Cr-Commit-Position: refs/heads/master@{#26434}
>
> Committed: https://crrev.com/ec42e002da03adb2db968dd5b7453341ddc59a5c
> Cr-Commit-Position: refs/heads/master@{#26448}

TBR=alph@chromium.org,mstarzinger@chromium.org,svenpanne@chromium.org,yurys@chromium.org,loislo@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=452067

Review URL: https://codereview.chromium.org/900223002

Cr-Commit-Position: refs/heads/master@{#26457}

Review URL: https://codereview.chromium.org/902853002

Cr-Commit-Position: refs/heads/master@{#26456}

Since v8:3629 is fixed, ICs and handlers do not retain objects.

Review URL: https://codereview.chromium.org/880253007

Cr-Commit-Position: refs/heads/master@{#26455}

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/900193002

Cr-Commit-Position: refs/heads/master@{#26454}

It must always populate int32_value_, even if that's lossy, because other code (specifically, constant folding for truncating operations) relies on it.

BUG=v8:3865
LOG=y

Review URL: https://codereview.chromium.org/897263002

Cr-Commit-Position: refs/heads/master@{#26453}

R=hpayer@chromium.org
BUG=chromium:454615
LOG=N

Review URL: https://codereview.chromium.org/900793004

Cr-Commit-Position: refs/heads/master@{#26452}

A new map wich references its keys weakly is added to v8.h. Internally it uses the same storage as JSWeakMap but doesn't depend on the JavaScript part of WeakMap implementation in weak-collection.js, hence it can be instantiated without entering any context.

BUG=chromium:437416
LOG=Y

Review URL: https://codereview.chromium.org/900123003

Cr-Commit-Position: refs/heads/master@{#26451}

When embedder detaches the global objects, its context must be garbage
collected eventually.

BUG=

Review URL: https://codereview.chromium.org/898663005

Cr-Commit-Position: refs/heads/master@{#26450}

size_t is the correct data type for this purpose. Our APIs (in particular
ExternalSourceStream::GetMoreData) are already using it, and there were some
static_casts to convert between them.

This CL doesn't intend to fix all of V8, just the minimal sense-making part
around scanner character streams.

BUG=

Review URL: https://codereview.chromium.org/864273005

Cr-Commit-Position: refs/heads/master@{#26449}

1) The hardcoded strings were converted into DeoptReason enum.

2) Deopt comment were converted into a pair location and deopt reason entries so
the deopt reason tracking mode would less affect the size of the RelocInfo table and heap.

3) DeoptReason entry in RelocInfo reuses kCommentTag value and generates short entry in RelocInfo table.

BUG=452067
LOG=n

Committed: https://crrev.com/c49820e45b57f128a98690940875c049f612dde6
Cr-Commit-Position: refs/heads/master@{#26434}

Review URL: https://codereview.chromium.org/874323003

Cr-Commit-Position: refs/heads/master@{#26448}

This reverts commit f578d35b because
(immutable) heap numbers are surprisingly mutable in V8. Someone else
might want to cleanup the mess, otherwise we'll just keep it this way.

TBR=jkummerow@chromium.org
BUG=chromium:454894
LOG=y

Review URL: https://codereview.chromium.org/898973003

Cr-Commit-Position: refs/heads/master@{#26447}

Rolling v8/buildtools to da0df3fdac6036e862addb1155a2d6c11b6c18d5

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/900793003

Cr-Commit-Position: refs/heads/master@{#26446}

Port 9eace97b

BUG=
R=chunyang.dai@intel.com

Review URL: https://codereview.chromium.org/895473002

Cr-Commit-Position: refs/heads/master@{#26445}

Reason for revert:
Fails mjsunit/asm/embenchen/box2d

BUG=

Review URL: https://codereview.chromium.org/893993003

Cr-Commit-Position: refs/heads/master@{#26444}

Port 13b97b62

Original commit message:
On platforms that don't push the return address on the stack at time of call, there was an error.

BUG=

Review URL: https://codereview.chromium.org/864713003

Cr-Commit-Position: refs/heads/master@{#26443}

BUG=455212
LOG=N
R=arv@chromium.org

Review URL: https://codereview.chromium.org/902703002

Cr-Commit-Position: refs/heads/master@{#26442}

We used to have a parse error for conflicting property keys. This check
was removed to match ES6 (SpiderMonkey & Chakra already made this change).
Since this check was removed we ended up with a few new cases when
generating code. For example, accessors always generated code even if
those should have been shadowed by a data property.

BUG=v8:3856
LOG=Y
R=adamk, dslomov@chromium.org

Review URL: https://codereview.chromium.org/895693002

Cr-Commit-Position: refs/heads/master@{#26441}

Motivation: Cleanup

BUG=None
R=adamk
LOG=N

Review URL: https://codereview.chromium.org/897633003

Cr-Commit-Position: refs/heads/master@{#26440}

On platforms that don't push the return address on the stack at time of call, there was an error.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/894753006

Cr-Commit-Position: refs/heads/master@{#26439}

Port 275e088a

BUG=chromium:455141
LOG=N

Review URL: https://codereview.chromium.org/876083006

Cr-Commit-Position: refs/heads/master@{#26438}

Class methods and accessors (both prototype and static) should be
non enumerable.

BUG=v8:3330
LOG=Y
R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/896643003

Cr-Commit-Position: refs/heads/master@{#26437}

BUG=

Review URL: https://codereview.chromium.org/882913006

Cr-Commit-Position: refs/heads/master@{#26436}

Revert of Externalize deoptimization reasons. (patchset #6 id:100001 of https://codereview.chromium.org/874323003/)

Reason for revert:
it broke the build

Original issue's description:
> Externalize deoptimization reasons.
>
> 1) The hardcoded strings were converted into DeoptReason enum.
>
> 2) Deopt comment were converted into a pair location and deopt reason entries so
> the deopt reason tracking mode would less affect the size of the RelocInfo table and heap.
>
> 3) DeoptReason entry in RelocInfo reuses kCommentTag value and generates short entry in RelocInfo table.
>
> BUG=452067
> LOG=n
>
> Committed: https://crrev.com/c49820e45b57f128a98690940875c049f612dde6
> Cr-Commit-Position: refs/heads/master@{#26434}

TBR=alph@chromium.org,mstarzinger@chromium.org,svenpanne@chromium.org,yurys@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=452067

Review URL: https://codereview.chromium.org/892843007

Cr-Commit-Position: refs/heads/master@{#26435}

1) The hardcoded strings were converted into DeoptReason enum.

2) Deopt comment were converted into a pair location and deopt reason entries so
the deopt reason tracking mode would less affect the size of the RelocInfo table and heap.

3) DeoptReason entry in RelocInfo reuses kCommentTag value and generates short entry in RelocInfo table.

BUG=452067
LOG=n

Review URL: https://codereview.chromium.org/874323003

Cr-Commit-Position: refs/heads/master@{#26434}

The syntax of this test snippet was so wrong ("function function") that it
wasn't testing what it was supposed to test.

R=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/896043003

Cr-Commit-Position: refs/heads/master@{#26433}

Port 6fc97a19

Original commit message:
The first try failed because I needed to make a better distinction
between clearing ICs according to policy at GC time or unconditional
clearing (say, via %ClearFunctionTypeFeedback).

It was also blocked by an issue in super constructor calls.
This fix (https://codereview.chromium.org/892113002/) needs to land
before checking in this CL.

BUG=

Review URL: https://codereview.chromium.org/896223002

Cr-Commit-Position: refs/heads/master@{#26432}