Revert https://codereview.chromium.org/1078093002/ and follow-on parser
patches due to a perf regression.

This reverts commit 53ddccfc.
This reverts commit 71d3213a.
This reverts commit 0f432ebb.
This reverts commit 1dbc4327.

R=marja@chromium.org

Review URL: https://codereview.chromium.org/1094653002

Cr-Commit-Position: refs/heads/master@{#27912}

BUG=

Review URL: https://codereview.chromium.org/1090813003

Cr-Commit-Position: refs/heads/master@{#27911}

In no-snap mode, creating 100 contexts can take a while.
This becomes even worse with always-opt.

R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1092003002

Cr-Commit-Position: refs/heads/master@{#27910}

R=svenpanne@chromium.org
BUG=v8:4037
LOG=N

Review URL: https://codereview.chromium.org/1051213005

Cr-Commit-Position: refs/heads/master@{#27909}

Review URL: https://codereview.chromium.org/1091553002

Cr-Commit-Position: refs/heads/master@{#27908}

Review URL: https://codereview.chromium.org/1083083004

Cr-Commit-Position: refs/heads/master@{#27907}

port 80982535 (r27898)

original commit message:

BUG=

Review URL: https://codereview.chromium.org/1086813004

Cr-Commit-Position: refs/heads/master@{#27906}

BUG=

Review URL: https://codereview.chromium.org/1089393004

Cr-Commit-Position: refs/heads/master@{#27905}

Revert of Refactor compilation dependency handling. (patchset #4 id:60001 of https://codereview.chromium.org/1095433002/)

Reason for revert:
[Sheriff] Causes crashes in laout tests:
http://build.chromium.org/p/client.v8/builders/V8-Blink%20Linux%2064%20%28dbg%29/builds/2543

Extra bisect run:
http://build.chromium.org/p/client.v8/builders/V8-Blink%20Linux%2064%20%28dbg%29/builds/2548

Original issue's description:
> Refactor compilation dependency handling.
>
> Extract a new data structure CompilationDependencies and move (most) logic there.
>
> R=mstarzinger@chromium.org,verwaest@chromium.org
> BUG=
>
> Committed: https://crrev.com/b882479f1c84a48961b8aec81fa1bb1225034784
> Cr-Commit-Position: refs/heads/master@{#27892}

TBR=mstarzinger@chromium.org,verwaest@chromium.org,titzer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/1093783002

Cr-Commit-Position: refs/heads/master@{#27904}

Rolling v8/tools/clang to 2afd19d64f7c67c73e2052e87fbe4e1bc2a671c9

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1098623002

Cr-Commit-Position: refs/heads/master@{#27903}

Revert of Revert "Remove early bail-out in VisitWeakList to investigate chrasher." (patchset #1 id:1 of https://codereview.chromium.org/1080303002/)

Reason for revert:
Still doesn't work

Original issue's description:
> Revert "Remove early bail-out in VisitWeakList to investigate chrasher."
>
> >  BUG=468601
> >  LOG=n
> >
> >  Review URL: https://codereview.chromium.org/1016353002
> >
> >  Cr-Commit-Position: refs/heads/master@{#27317}
>
> R=hpayer@chromium.org
> BUG=v8:3996,chromium:468601
> LOG=n
>
> Committed: https://crrev.com/835eeafe32f442d7b43fe175237de2c70ed7ceef
> Cr-Commit-Position: refs/heads/master@{#27814}

TBR=hpayer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:3996,chromium:468601

Review URL: https://codereview.chromium.org/1092783002

Cr-Commit-Position: refs/heads/master@{#27902}

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/1081443006

Cr-Commit-Position: refs/heads/master@{#27901}

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1052823003

Cr-Commit-Position: refs/heads/master@{#27900}

BUG=chromium:475884
LOG=y
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/1086403002

Cr-Commit-Position: refs/heads/master@{#27899}

BUG=chromium:476592
LOG=n

Review URL: https://codereview.chromium.org/1086333002

Cr-Commit-Position: refs/heads/master@{#27898}

Use smaller heap growing factor in idle notification to start incremental marking when there is idle time >16ms.

BUG=chromium:477323
LOG=y

Review URL: https://codereview.chromium.org/1090963002

Cr-Commit-Position: refs/heads/master@{#27897}

This flag is intended as a staging flag for TurboFan. It serves as a
single flag that always enables a most recent configuration of TurboFan
for test suites and benchmarks, without needing to update test drivers.

R=titzer@chromium.org,machenbach@chromium.org

Review URL: https://codereview.chromium.org/1094573002

Cr-Commit-Position: refs/heads/master@{#27896}

Port 13459c1a

Original commit message:
Calling new Array(JSObject::kInitialMaxFastElementArray) in optimized code
makes a stub call that bails out due to the length. Currently, the bailout
code a) doesn't have the allocation site, and b) wouldn't use it if it did
because the length is perceived to be too high.

This CL passes the allocation site to the stub call (rather than undefined),
and alters the bailout code to utilize the feedback.

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

Review URL: https://codereview.chromium.org/1089913002

Cr-Commit-Position: refs/heads/master@{#27895}

Register pop order bug only surfaced after vector-ic optimization
in https://codereview.chromium.org/1053843003 was landed.

TEST=mjsunit/string-index.js
BUG=

Review URL: https://codereview.chromium.org/1074123004

Cr-Commit-Position: refs/heads/master@{#27894}

Port 35a67b74

Original commit message:
Thanks to some careful assumptions, we can examine the object found at
vector[slot] and trust it's a heap object where the second field is
either a map if it's a WeakCell, or definitely not a map if it's a
Symbol, String or FixedArray. Use this to save a memory read.

BUG=

Review URL: https://codereview.chromium.org/1053843003

Cr-Commit-Position: refs/heads/master@{#27757}

Review URL: https://codereview.chromium.org/1083413003

Cr-Commit-Position: refs/heads/master@{#27893}

Extract a new data structure CompilationDependencies and move (most) logic there.

R=mstarzinger@chromium.org,verwaest@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1095433002

Cr-Commit-Position: refs/heads/master@{#27892}

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1095513003

Cr-Commit-Position: refs/heads/master@{#27891}

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

Review URL: https://codereview.chromium.org/1086423003

Cr-Commit-Position: refs/heads/master@{#27890}

Revert of Migrate error messages, part 2. (patchset #1 id:1 of https://codereview.chromium.org/1086313003/)

Reason for revert:
[Sheriff]: This changes layout test expectations e.g.
http://build.chromium.org/p/client.v8/builders/V8-Blink%20Win/builds/2964

Original issue's description:
> Migrate error messages, part 2.
>
> Motivation for this is reducing the size of the native context.
>
> Committed: https://crrev.com/d3b788df0a4ccfedbe6e1df5e214cb6ba2792a65
> Cr-Commit-Position: refs/heads/master@{#27878}

TBR=mvstanton@chromium.org,yangguo@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1095573002

Cr-Commit-Position: refs/heads/master@{#27889}

The previous restrictions were overshooting (didn't allow a class to refer to a
later class under any circumstances); after this CL we're undershooting (allow
referring to any class from inside a method).

Implementing the correct checks (allow referring only if the class declarations
are in a consecutive block and if there's no dependency cycle) will be
implemented as a follow up.

BUG=v8:3956
LOG=N

Review URL: https://codereview.chromium.org/1087543004

Cr-Commit-Position: refs/heads/master@{#27888}

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1086363002

Cr-Commit-Position: refs/heads/master@{#27887}

BUG=

Review URL: https://codereview.chromium.org/1094613002

Cr-Commit-Position: refs/heads/master@{#27886}

Implements the strong mode proposal's restrictions on the syntax of the
switch statement. Also fixes a minor bug with empty statements in strong
mode and improves StrongUndefinedArrow parser synch tests.

BUG=v8:3956
LOG=N

Review URL: https://codereview.chromium.org/1084983002

Cr-Commit-Position: refs/heads/master@{#27885}

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1086253004

Cr-Commit-Position: refs/heads/master@{#27884}

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1040233003

Cr-Commit-Position: refs/heads/master@{#27883}

Will be used for calculating changes between versions

BUG=
NOTRY=true

Review URL: https://codereview.chromium.org/1095483002

Cr-Commit-Position: refs/heads/master@{#27882}

TBR=jkummerow@chromium.org
TEST=mjsunit/debug-ignore-breakpoints
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1087673003

Cr-Commit-Position: refs/heads/master@{#27881}

DoParseProgram doesn't appear to need to receive toplevel scopes as
arguments; it can properly set the end_position of the scopes to the
scanner's position after parsing is complete.

R=marja@chromium.org
BUG=
LOG=N

Review URL: https://codereview.chromium.org/1091743002

Cr-Commit-Position: refs/heads/master@{#27880}

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1094563002

Cr-Commit-Position: refs/heads/master@{#27879}

Motivation for this is reducing the size of the native context.

Review URL: https://codereview.chromium.org/1086313003

Cr-Commit-Position: refs/heads/master@{#27878}

port 0179ec57 (r27846).

original commit message:

 The cells are stored on prototypes (in their map's PrototypeInfo). When a
 prototype object changes its map, then both its own validity cell and those
 of all "downsstream" prototypes are invalidated; handlers for a given receiver
 embed the currently valid cell for that receiver's prototype during their
 compilation and check it on execution.

BUG=

Review URL: https://codereview.chromium.org/1090803002

Cr-Commit-Position: refs/heads/master@{#27877}

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1086263002

Cr-Commit-Position: refs/heads/master@{#27876}

port 13459c1a (r27857)

original commit message:

    Array() in optimized code can create with wrong ElementsKind in corner cases.

    Calling new Array(JSObject::kInitialMaxFastElementArray) in optimized code
    makes a stub call that bails out due to the length. Currently, the bailout
    code a) doesn't have the allocation site, and b) wouldn't use it if it did
    because the length is perceived to be too high.

    This CL passes the allocation site to the stub call (rather than undefined),
    and alters the bailout code to utilize the feedback.

BUG=

Review URL: https://codereview.chromium.org/1088423002

Cr-Commit-Position: refs/heads/master@{#27875}

Follow-up to 333219a7.

NOTRY=true
NOTREECHECKS=true

Review URL: https://codereview.chromium.org/1095503002

Cr-Commit-Position: refs/heads/master@{#27874}

port 776770c0 (r27827).

original commit message:

  This needs "Pass load ic state through the Oracle"
  (https://codereview.chromium.org/1083933002/) to land first.

BUG=

Review URL: https://codereview.chromium.org/1093433004

Cr-Commit-Position: refs/heads/master@{#27873}