Port fb8e6136

Original commit message:
We were deopting without learning anything.

This is a rebase/reland of https://codereview.chromium.org/368263003

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

Review URL: https://codereview.chromium.org/1113063002

Cr-Commit-Position: refs/heads/master@{#28177}

R=ulan@chromium.org
BUG=v8:4054
LOG=N

Review URL: https://codereview.chromium.org/1114043002

Cr-Commit-Position: refs/heads/master@{#28176}

This has to wait until issue 4065 has been fixed.

R=ulan@chromium.org
BUG=v8:2340, v8:4065, chromium:482312
LOG=N

Review URL: https://codereview.chromium.org/1110393002

Cr-Commit-Position: refs/heads/master@{#28175}

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1109343004

Cr-Commit-Position: refs/heads/master@{#28174}

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/1109853003

Cr-Commit-Position: refs/heads/master@{#28173}

Reorganize some bailout conditions to be after the decision to use TurboFan.

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1110573002

Cr-Commit-Position: refs/heads/master@{#28172}

Review URL: https://codereview.chromium.org/1119683002

Cr-Commit-Position: refs/heads/master@{#28171}

This is to pacify MSAN.

R=mvstanton@chromium.org
BUG=465759
LOG=N

Review URL: https://codereview.chromium.org/1119693004

Cr-Commit-Position: refs/heads/master@{#28170}

BUG=470930
LOG=N
R=jochen@chromium.org

Review URL: https://codereview.chromium.org/1116933002

Cr-Commit-Position: refs/heads/master@{#28169}

Just give internal ones an ArrayBuffer with a NULL backing store. This
simplifies the access checks a lot.

BUG=v8:3996
R=hpayer@chromium.org,verwaest@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1109353003

Cr-Commit-Position: refs/heads/master@{#28168}

BUG=

Review URL: https://codereview.chromium.org/1116923002

Cr-Commit-Position: refs/heads/master@{#28167}

BUG=v8:3803
LOG=n
TBR=mstarzinger@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1112373002

Cr-Commit-Position: refs/heads/master@{#28166}

Handled a TODO that sent builtin function apply to the runtime on property get.

R=yangguo@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1120613002

Cr-Commit-Position: refs/heads/master@{#28165}

EOS token location is useless for users and messages.js are not ready for its location.
With this CL we use location of token before EOS for it.

LOG=Y
BUG=chromium:480652
R=yurys@chromium.org,yangguo@chromium.org

Review URL: https://codereview.chromium.org/1100993003

Cr-Commit-Position: refs/heads/master@{#28164}

We were deopting without learning anything.

This is a rebase/reland of https://codereview.chromium.org/368263003

BUG=v8:3417
LOG=N

Review URL: https://codereview.chromium.org/1109333003

Cr-Commit-Position: refs/heads/master@{#28163}

An initial 'code age' state that will turn into a 'pre-aging' code age only after it was executed the first time.

BUG=470930
LOG=Y

Review URL: https://codereview.chromium.org/1107233004

Cr-Commit-Position: refs/heads/master@{#28162}

BUG=

Review URL: https://codereview.chromium.org/1104353003

Cr-Commit-Position: refs/heads/master@{#28161}

R=bmeurer@chromium.org
TEST=cctest/test-js-context-specialization

Review URL: https://codereview.chromium.org/1112343002

Cr-Commit-Position: refs/heads/master@{#28160}

Implements the strong mode proposal's restrictions on implicit conversions
for the binary + operator. Test suite is also cleaned up/refactored to allow
easier testing of the comparison operators in the future.

BUG=v8:3956
LOG=N

Review URL: https://codereview.chromium.org/1109223004

Cr-Commit-Position: refs/heads/master@{#28159}

https://codereview.chromium.org/1117663002 contained a copy-paste
error; this is a follow-up fixing that so that error messages now
contain the correct filename when using the --extra option to js2c.py.

R=yangguo@chromium.org, jochen@chromium.org

Review URL: https://codereview.chromium.org/1120593002

Cr-Commit-Position: refs/heads/master@{#28158}

BUG=

Review URL: https://codereview.chromium.org/1112213005

Cr-Commit-Position: refs/heads/master@{#28157}

Original issue's description:
> Remove the weak list of array buffers
>
> Instead, collect live array buffers during marking and free pointers we
> no longer found.
>
> BUG=v8:3996
> R=hpayer@chromium.org
> LOG=n

BUG=v8:3996
TBR=hpayer@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1115853004

Cr-Commit-Position: refs/heads/master@{#28156}

BUG=

Review URL: https://codereview.chromium.org/1110393003

Cr-Commit-Position: refs/heads/master@{#28155}

R=mstarzinger@chromium.org
BUG=chromium:471702
LOG=N

Review URL: https://codereview.chromium.org/1120573002

Cr-Commit-Position: refs/heads/master@{#28154}

Better encapsulate the source position handling in TurboFan.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/1105363003

Cr-Commit-Position: refs/heads/master@{#28153}

R=machenbach@chromium.org
TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1115133002

Cr-Commit-Position: refs/heads/master@{#28152}

The existing logic would show the full source for all classes, even
built-in ones.

R=arv@chromium.org,dslomov@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1112113002

Cr-Commit-Position: refs/heads/master@{#28151}

This CL contains the first steps towards tail call optimization:

  * Structurally detect tail calls during instruction selection,
    looking for special return/call combinations.

  * Added new architecture-specific instructions for tail calls which
    jump instead of call and take care of frame adjustment.

  * Moved some code around.

Currently we restrict tail calls to callees which only use registers
for arguments/return value and to call sites which are explicitly
marked as being OK for tail calls. This excludes, among other things,
call sites in sloppy JS functions and our IC machinery (both need in
general to be able to access the caller's frame).

All this is behind a flag --turbo-tail-calls, which is currently off
by default, so it can easily be toggled.

Review URL: https://codereview.chromium.org/1108563002

Cr-Commit-Position: refs/heads/master@{#28150}

BUG=chromium:478460
LOG=n
NOTRY=true
TBR=bmeurer@chromium.org, mvstanton@chromium.org

Review URL: https://codereview.chromium.org/1107973007

Cr-Commit-Position: refs/heads/master@{#28149}

Revert of Remove the weak list of array buffers (patchset #8 id:140001 of https://codereview.chromium.org/1114563002/)

Reason for revert:
[Sheriff] Crashes in layout tests:
https://chromegw.corp.google.com/i/client.v8/builders/V8-Blink%20Linux%2064%20%28dbg%29/builds/2668

Original issue's description:
> Remove the weak list of array buffers
>
> Instead, collect live array buffers during marking and free pointers we
> no longer found.
>
> BUG=v8:3996
> R=hpayer@chromium.org
> LOG=n
>
> Committed: https://crrev.com/2d39709cf5ee17637f6f2d75380a9e61ae0b342b
> Cr-Commit-Position: refs/heads/master@{#28132}

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

Review URL: https://codereview.chromium.org/1115043005

Cr-Commit-Position: refs/heads/master@{#28148}

The method is not used anywhere, and it is a bad idea in general anyway.
If you see a need to call YieldCPU, then you're code is probably in need
of a redesign!

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/1116853002

Cr-Commit-Position: refs/heads/master@{#28147}

It's useful for queue-like data structures.

R=yangguo@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1117713002

Cr-Commit-Position: refs/heads/master@{#28146}

Fix AIX compiler warning indicating that variable may not be
initialized

	modified:   src/heap/heap.cc

R=danno@chromium.org, svenpanne@chromium.org, mbrandy@us.ibm.com

BUG=

Review URL: https://codereview.chromium.org/1112883002

Cr-Commit-Position: refs/heads/master@{#28145}

Switch to larger TOC on AIX for unitttests as the size has grown
such that it no longer compiles with the default TOC size

	modified:   unittests.gyp

R=danno@chromium.org, svenpanne@chromium.org, mbrandy@us.ibm.com

BUG=

Review URL: https://codereview.chromium.org/1115763003

Cr-Commit-Position: refs/heads/master@{#28144}

Added rounding according to fcsr, CVT_W_D and RINT.D instruction in assembler, dissasembler and simulator and wrote appropiate tests.

BUG=

Review URL: https://codereview.chromium.org/1108583003

Cr-Commit-Position: refs/heads/master@{#28143}

Now it's possible to specify the desired trybots for perf
tries, e.g.:

tools/try_perf.py --linux64_haswell octane sunspider

BUG=chromium:478460
LOG=n
NOTRY=true

Review URL: https://codereview.chromium.org/1114913002

Cr-Commit-Position: refs/heads/master@{#28142}

Rolling v8/build/gyp to 0bb67471bca068996e15b56738fa4824dfa19de0

Rolling v8/buildtools to 15f5fc6fdb1795e2b99f66e5bc6c01e9fb62b436

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1110063010

Cr-Commit-Position: refs/heads/master@{#28141}

- allows the optimization of emitted gap move code since the representation of the value in the register is known
- necessary preparation for vector register allocation
- prepare for slot sharing for any value of the same byte width

TBR=jarin@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1111323003

Cr-Commit-Position: refs/heads/master@{#28140}

Revert of [turbofan] add MachineType to AllocatedOperand (patchset #17 id:310001 of https://codereview.chromium.org/1087793002/)

Reason for revert:
[Sheriff] Breaks compile on chromium asan and v8 msan:
http://build.chromium.org/p/client.v8/builders/Linux%20ASAN%20Builder/builds/3446
http://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20arm64%20-%20sim%20-%20MSAN/builds/2085

Original issue's description:
> [turbofan] add MachineType to AllocatedOperand
>
> - allows the optimization of emitted gap move code since the representation of the value in the register is known
> - necessary preparation for vector register allocation
> - prepare for slot sharing for any value of the same byte width
>
> BUG=
>
> Committed: https://crrev.com/3a025d1ab6437559f86a464767aa03d2d9789f6f
> Cr-Commit-Position: refs/heads/master@{#28137}

TBR=jarin@chromium.org,dcarney@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/1119483003

Cr-Commit-Position: refs/heads/master@{#28139}

R=bmeurer@chromium.org
TEST=cctest/test-node

Review URL: https://codereview.chromium.org/1118433002

Cr-Commit-Position: refs/heads/master@{#28138}