port e0aa8ebf (r27103).

original commit message:

  This reduces the size of the StackHandler by one word. We no longer
  need to keep track of the code object, as the stack walk finds it.

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/1022403002

Cr-Commit-Position: refs/heads/master@{#27353}

BUG=v8:3230
R=dslomov@chromium.org, arv@chromium.org
LOG=N

Review URL: https://codereview.chromium.org/1027593005

Cr-Commit-Position: refs/heads/master@{#27352}

BUG=

Review URL: https://codereview.chromium.org/1025453003

Cr-Commit-Position: refs/heads/master@{#27351}

Rolling v8/third_party/icu to 7c81740601355556e630da515b74d889ba2f8d08

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1030513002

Cr-Commit-Position: refs/heads/master@{#27350}

Port bef80fcf

BUG=v8:3977
LOG=N

Review URL: https://codereview.chromium.org/1028703002

Cr-Commit-Position: refs/heads/master@{#27349}

as of https://reviews.freebsd.org/D848. This makes V8 build on
FreeBSD-current (and the forthcoming 11).

BUG=none
LOG=n

Review URL: https://codereview.chromium.org/1025823003

Cr-Commit-Position: refs/heads/master@{#27348}

Port d21fd154

TEST=mjsunit/harmony/reflect-construct
BUG=

Review URL: https://codereview.chromium.org/1022053002

Cr-Commit-Position: refs/heads/master@{#27347}

BUG=chromium:469148
LOG=y
R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/1023123003

Cr-Commit-Position: refs/heads/master@{#27346}

Revert of Allow compaction when incremental marking is on. (patchset #1 id:1 of https://codereview.chromium.org/1014263002/)

Reason for revert:
It seems to cause crbug/469146.

Original issue's description:
> Allow compaction when incremental marking is on.
>
> BUG=chromium:450824
> LOG=NO
>
> Committed: https://crrev.com/92f96e4e9a527fcb085b68f81ee14b26acdd4719
> Cr-Commit-Position: refs/heads/master@{#27267}

TBR=hpayer@chromium.org,ulan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:450824

Review URL: https://codereview.chromium.org/1026813002

Cr-Commit-Position: refs/heads/master@{#27345}

BUG=v8:3977
R=dslomov@chromium.org, arv@chromium.org
LOG=N

Review URL: https://codereview.chromium.org/1018043003

Cr-Commit-Position: refs/heads/master@{#27344}

Port 3aa206b8

BUG=v8:3952
LOG=n

Review URL: https://codereview.chromium.org/1020223002

Cr-Commit-Position: refs/heads/master@{#27343}

port 1382879f (r27016).

oringinal commit message:

    [turbofan] Implement throwing exceptions into TurboFan code.

    This extends the stack unwinding logic to respect optimized frames
    and perform a lookup in the handler table to find handlers. It also
    contains fixes to the API call stubs to allow a stack walk while
    promoting scheduled exceptions.

BUG=

Review URL: https://codereview.chromium.org/1023943002

Cr-Commit-Position: refs/heads/master@{#27342}

R=jarin@chromium.org
BUG=chromium:468162
LOG=y

Review URL: https://codereview.chromium.org/1027753002

Cr-Commit-Position: refs/heads/master@{#27341}

This speeds up multiple uses of the serializer quite a bit.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/1003363003

Cr-Commit-Position: refs/heads/master@{#27340}

TBR=dslomov@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1027693003

Cr-Commit-Position: refs/heads/master@{#27339}

R=dslomov@chromium.org
BUG=v8:3956
LOG=N

Review URL: https://codereview.chromium.org/1021213002

Cr-Commit-Position: refs/heads/master@{#27338}

String functions are shipping since 4.1/Chrome M41, it is time to unflag.

R=yanngguo@chromium.org,rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1024813002

Cr-Commit-Position: refs/heads/master@{#27337}

Turn Math.acos, Math.asin, Math.atan, Math.atan2, Math.sign and Math.trunc
into inlinable builtins.

R=yangguo@chromium.org
BUG=v8:3952
LOG=n

Review URL: https://codereview.chromium.org/1027713002

Cr-Commit-Position: refs/heads/master@{#27336}

Maybe it was overapproximated via the idle notification already, so just
don't retry in that case

BUG=chromium:469023
R=hpayer@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1025603003

Cr-Commit-Position: refs/heads/master@{#27335}

BUG=v8:3974
LOG=NO

Review URL: https://codereview.chromium.org/1021523002

Cr-Commit-Position: refs/heads/master@{#27334}

BUG=chromium:469089
LOG=n
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1026683002

Cr-Commit-Position: refs/heads/master@{#27333}

port 2ecdf736 (r27014).

original commit message:

  Fix exception for assignment to uninitialised const.

BUG=

Review URL: https://codereview.chromium.org/1028533002

Cr-Commit-Position: refs/heads/master@{#27332}

To ensure termination, we need to be sure that once we start weakening
a node, we keep weakening that node in subsequent re-typings. Until now,
we were guessing that we previously weakened from the type. This
change introduces a set of nodes that have already be weakened, so
that we have a reliable way to detect previous weakening.

BUG=chromium:468799
LOG=n
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1019883002

Cr-Commit-Position: refs/heads/master@{#27331}

R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/1028563002

Cr-Commit-Position: refs/heads/master@{#27330}

R=dcarney@chromium.org, yangguo@chromium.org
BUG=v8:3952
LOG=n

Review URL: https://codereview.chromium.org/1021183002

Cr-Commit-Position: refs/heads/master@{#27329}

R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/1028553002

Cr-Commit-Position: refs/heads/master@{#27328}

Rolling v8/third_party/icu to d319ad9e25e8045f051dcd30bd5835f99936af6c

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1021953002

Cr-Commit-Position: refs/heads/master@{#27327}

Port d21fd154

Known issue: the mjsunit/harmony/reflect-construct test fails, it will be addressed in a follow-up CL.

BUG=

Review URL: https://codereview.chromium.org/1021863002

Cr-Commit-Position: refs/heads/master@{#27326}

The problem manifests itself when parsing manages to return something
meaningful in the presence of a stack overflow. This happens because
calling ParserBase::Next() will still return one valid token on stack
overflow, before starting to return invalid tokens.

Take the following input as example:

        a.map(v => v + 1);
              | |
       already   next token
        parsed   (which will be an invalid token
  (identifier)   because of a stack overflow)

The "v" may have been already parsed into a VariableProxy, then if a
stack overflow occurs, next token will be an invalid token (instead
of Token::ARROW), but the parser will return the VariableProxy.

This always happens when lazy-parsing arrow functions, so the position
in the input stream where the the arrow function code ends is known.
This fix adds a check that ensures that parsing ended at the end
position of the arrow function.

BUG=465671
LOG=N

Review URL: https://codereview.chromium.org/1023483003

Cr-Commit-Position: refs/heads/master@{#27325}

Cannot use Handle<T>::cast in Unique<T>::cast since it will try to do a T::cast (and its typecheck) concurrently, which is unsafe concurrently on moving values

BUG=

Review URL: https://codereview.chromium.org/1022943002

Cr-Commit-Position: refs/heads/master@{#27324}

TBR=verwaest@chromium.org,ulan@chromium.org,ishell@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1027463002

Cr-Commit-Position: refs/heads/master@{#27323}

BUG=chromium:468749
LOG=NO
TEST=Emscripten/NBodyJava

Review URL: https://codereview.chromium.org/1014093005

Cr-Commit-Position: refs/heads/master@{#27322}

Rename kMaxFrameRenderingIdleTime to kMaxActiveIdleTime and adjust it to the currently maximum value of 50ms passed in by the Blink scheduler.

BUG=468692
LOG=n

Review URL: https://codereview.chromium.org/1024543002

Cr-Commit-Position: refs/heads/master@{#27321}

R=dslomov@chromium.org
BUG=v8:3956
LOG=N

Review URL: https://codereview.chromium.org/1019283002

Cr-Commit-Position: refs/heads/master@{#27320}

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1022783002

Cr-Commit-Position: refs/heads/master@{#27319}

With this patch, it'll look like this:

$ out/x64.optdebug/d8 --expose-trigger-failure test/mjsunit/mjsunit.js test/mjsunit/verify-assert-false.js

==== C stack trace ===============================

 1: V8_Fatal
 2: v8::internal::FunctionCallbackArguments::Call(void (*)(v8::FunctionCallbackInfo<v8::Value> const&))
 3: 0x727ced
 4: 0x72b6ba
 5: 0x188c7f607f9b

BUG=none
R=svenpanne@chromium.org
LOG=y

Review URL: https://codereview.chromium.org/1018313003

Cr-Commit-Position: refs/heads/master@{#27318}

BUG=468601
LOG=n

Review URL: https://codereview.chromium.org/1016353002

Cr-Commit-Position: refs/heads/master@{#27317}

BUG=v8:3900
LOG=N
R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/913073003

Cr-Commit-Position: refs/heads/master@{#27316}

BUG=

Review URL: https://codereview.chromium.org/998883002

Cr-Commit-Position: refs/heads/master@{#27315}

BUG=

Review URL: https://codereview.chromium.org/1009603003

Cr-Commit-Position: refs/heads/master@{#27314}