Rolling v8/buildtools to 93b3d0af1b30db55ee42bd2e983f7753153217db

Rolling v8/tools/clang to eb87c73202018d13f2f713e1304ab4edf9a6f49f

TBR=jochen@chromium.org

Review URL: https://codereview.chromium.org/962223002

Cr-Commit-Position: refs/heads/master@{#26918}

BUG=
TBR=svenpanne

Review URL: https://codereview.chromium.org/960903005

Cr-Commit-Position: refs/heads/master@{#26917}

Save Unknown position as zero in RelocInfo.
Remove copy constructor of SourcePosition because it is trivial.
Mechanical replace int raw_position with SourcePosition position.

BUG=452067
LOG=n

Review URL: https://codereview.chromium.org/959203002

Cr-Commit-Position: refs/heads/master@{#26916}

BUG=

Committed: https://crrev.com/56039af476797accc238dcb24c7ab926899287a0
Cr-Commit-Position: refs/heads/master@{#26881}

Review URL: https://codereview.chromium.org/955393002

Cr-Commit-Position: refs/heads/master@{#26915}

BUG=v8:3929
LOG=Y

Review URL: https://codereview.chromium.org/959223002

Cr-Commit-Position: refs/heads/master@{#26914}

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/967483003

Cr-Commit-Position: refs/heads/master@{#26913}

BUG=v8:3929
LOG=y

Review URL: https://codereview.chromium.org/962983002

Cr-Commit-Position: refs/heads/master@{#26912}

Without this shortcut we generate one BooleanNot per JSUnaryNot with
number input, which is quite common in asm.js. These dead nodes then
survive until the late control reducer runs, and may prevent
optimizations in the mean time.

R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/963713002

Cr-Commit-Position: refs/heads/master@{#26911}

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/964843002

Cr-Commit-Position: refs/heads/master@{#26910}

MIPS: Skip the mapcheck on the global object since the global proxy and cell are already checked (or the global object map for contextual global loads).

Port 6af7ca6b

BUG=

Review URL: https://codereview.chromium.org/957393002

Cr-Commit-Position: refs/heads/master@{#26909}

port 6af7ca6b (r26886)

original commit message:

  Skip the mapcheck on the global object since the global proxy and cell are already
  checked (or the global object map for contextual global loads).

BUG=

Review URL: https://codereview.chromium.org/965693002

Cr-Commit-Position: refs/heads/master@{#26908}

Review URL: https://codereview.chromium.org/926553004

Cr-Commit-Position: refs/heads/master@{#26907}

 this is introduced by 88c4f52c (r26783)

BUG=

Review URL: https://codereview.chromium.org/958243004

Cr-Commit-Position: refs/heads/master@{#26906}

port e9cdcb71 (r26875)

original commit message:
  Only dynamically perform access checks on the receiver if it's a JSGlobalProxy.
  Proxies up the chain are guaranteed to provide access if we had access to the receiver,
  since otherwise we wouldn't have been able to compile the stub in the first place.
  If the security check would change, the window navigates, changing the map of the JSGlobalProxy.

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/964813002

Cr-Commit-Position: refs/heads/master@{#26905}

port affcfaf4 (r26835).

original commit message:

  Move Maps' back pointers from "transitions" to "constructor" field

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/964783002

Cr-Commit-Position: refs/heads/master@{#26904}

port 119cb566 (r26696).

original commit message:

  Stop using HeapType in IC and Crankshaft

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/958283002

Cr-Commit-Position: refs/heads/master@{#26903}

For now we just use the RawMachineAssembler, this will be changed
later to use the whole TurboFan pipeline.

Review URL: https://codereview.chromium.org/925373002

Cr-Commit-Position: refs/heads/master@{#26902}

  This is introduced by acd9c46c (r26691).

BUG=

Review URL: https://codereview.chromium.org/965673002

Cr-Commit-Position: refs/heads/master@{#26901}

Revert of Also skip when the target is the global object (patchset #1 id:1 of https://codereview.chromium.org/961723002/)

Reason for revert:
Breaks unscopables and fix attempt needed to be reverted too.

Original issue's description:
> Also skip when the target is the global object
>
> BUG=
>
> Committed: https://crrev.com/cc918d30b9d586ce974b71232473f2ae3c5e7847
> Cr-Commit-Position: refs/heads/master@{#26887}

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

Review URL: https://codereview.chromium.org/960363002

Cr-Commit-Position: refs/heads/master@{#26900}

Revert of Invalidate the global property cell when converting from data to accessor. (patchset #1 id:1 of https://codereview.chromium.org/961003002/)

Reason for revert:
Breaks gc stress, e.g.: http://build.chromium.org/p/client.v8/builders/V8%20GC%20Stress%20-%201/builds/2322

Original issue's description:
> Invalidate the global property cell when converting from data to accessor.
>
> BUG=
> TBR=jkummerow@chromium.org,
>
> Committed: https://crrev.com/6a12dc240b1faffa500ff269077d832ecc74239d
> Cr-Commit-Position: refs/heads/master@{#26896}

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

Review URL: https://codereview.chromium.org/958113004

Cr-Commit-Position: refs/heads/master@{#26899}

Revert of MIPS: Also skip when the target is the global object. (patchset #1 id:1 of https://codereview.chromium.org/957413002/)

Reason for revert:
Need to revert the ported CL.

Original issue's description:
> MIPS: Also skip when the target is the global object.
>
> Port cc918d30
>
> BUG=
>
> Committed: https://crrev.com/b24a0efa447235e11b9ff9d1eeaada06131b2e04
> Cr-Commit-Position: refs/heads/master@{#26897}

TBR=danno@chromium.org,verwaest@chromium.org,paul.lind@imgtec.com,gergely.kis@imgtec.com,akos.palfi@imgtec.com,dusan.milosavljevic@imgtec.com,balazs.kilvady@imgtec.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/963603002

Cr-Commit-Position: refs/heads/master@{#26898}

Port cc918d30

BUG=

Review URL: https://codereview.chromium.org/957413002

Cr-Commit-Position: refs/heads/master@{#26897}

BUG=
TBR=jkummerow@chromium.org,

Review URL: https://codereview.chromium.org/961003002

Cr-Commit-Position: refs/heads/master@{#26896}

This also adds a new VariableMode, IMPORT, which will be
used to do appropriate binding for Import-declared Variables.

Only named imports are handled for now. "import *" and default
import syntaxes have had their TODOs adjusted to match the new
code structure.

BUG=v8:1569
LOG=n

Review URL: https://codereview.chromium.org/948303004

Cr-Commit-Position: refs/heads/master@{#26895}

Port e9cdcb71

Original commit message:
Proxies up the chain are guaranteed to provide access if we had access to the receiver, since otherwise we wouldn't have been able to compile the stub in the first place. If the security check would change, the window navigates, changing the map of the JSGlobalProxy.

BUG=

Review URL: https://codereview.chromium.org/958923002

Cr-Commit-Position: refs/heads/master@{#26894}

This reverts commit b57be748 and
disables the test/mjsunit/debug-clearbreakpointgroup.js because
BreakLocationIterator::ClearBreakPoint is already broken for unrelated reasons (see v8:3924).

BUG=v8:3877
LOG=N
TEST=cctest/test-heap/Regress3877

Review URL: https://codereview.chromium.org/957373002

Cr-Commit-Position: refs/heads/master@{#26893}

BUG=v8:3923
LOG=N
R=marja,rossberg

Review URL: https://codereview.chromium.org/961823002

Cr-Commit-Position: refs/heads/master@{#26892}

BUG=

Review URL: https://codereview.chromium.org/958023002

Cr-Commit-Position: refs/heads/master@{#26891}

R=mvstanton@chromium.org
BUG=

Review URL: https://codereview.chromium.org/955243002

Cr-Commit-Position: refs/heads/master@{#26890}

(Discovered when landing crrev.com/959693002)

R=jochen@chromium.org
BUG=

Review URL: https://codereview.chromium.org/960883003

Cr-Commit-Position: refs/heads/master@{#26889}

Reuse optimization introduced in 6dee8884.

TEST=
BUG=

Review URL: https://codereview.chromium.org/960963002

Cr-Commit-Position: refs/heads/master@{#26888}

BUG=

Review URL: https://codereview.chromium.org/961723002

Cr-Commit-Position: refs/heads/master@{#26887}

Skip the mapcheck on the global object since the global proxy and cell are already checked (or the global object map for contextual global loads).

BUG=

Review URL: https://codereview.chromium.org/961693002

Cr-Commit-Position: refs/heads/master@{#26886}

Revert of Default-enable external startup data for Linux for stand-alone builds. (patchset #1 id:1 of https://codereview.chromium.org/959693002/)

Reason for revert:
Breaks "Simple Leaks Check"

Original issue's description:
> Default-enable external startup data for Linux for stand-alone builds.
>
> Notes:
> - Other platforms to follow later.
> - This follows Chromium practice, that mostly uses this feature these days.
> - The statically linked-in startup data will stay. So whoever prefers
>   the old way just needs to set the flag differently.
>
> BUG=
>
> Committed: https://crrev.com/6d0dcaabe55ca3556bebfd771fbc7fd560fdd4e0
> Cr-Commit-Position: refs/heads/master@{#26884}

TBR=machenbach@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/962593003

Cr-Commit-Position: refs/heads/master@{#26885}

Notes:
- Other platforms to follow later.
- This follows Chromium practice, that mostly uses this feature these days.
- The statically linked-in startup data will stay. So whoever prefers
  the old way just needs to set the flag differently.

BUG=

Review URL: https://codereview.chromium.org/959693002

Cr-Commit-Position: refs/heads/master@{#26884}

Revert of Fix memory leak caused by field type in descriptor array. (patchset #3 id:40001 of https://codereview.chromium.org/955063002/)

Reason for revert:
Breaks test/mjsunit/debug-clearbreakpointgroup.js on arm64.debug.

Original issue's description:
> Fix memory leak caused by field type in descriptor array.
>
> When a field type is a map, it is wrapped in a weak cell upon storing to the descriptor array.
>
> Map::GetFieldType(i) does the unwrapping.
>
> BUG=v8:3877
> LOG=N
> TEST=cctest/test-heap/Regress3877
>
> Committed: https://crrev.com/77d3ae0e119893ac8d34ea6ca090cddd5bbf987e
> Cr-Commit-Position: refs/heads/master@{#26879}

TBR=verwaest@chromium.org,ulan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:3877

Review URL: https://codereview.chromium.org/960103003

Cr-Commit-Position: refs/heads/master@{#26883}

Revert of ensure host compiler is always clang when cross compiling from linux (patchset #6 id:100001 of https://codereview.chromium.org/955393002/)

Reason for revert:
broke some things

Original issue's description:
> ensure host compiler is always clang when cross compiling from linux
>
> BUG=
>
> Committed: https://crrev.com/56039af476797accc238dcb24c7ab926899287a0
> Cr-Commit-Position: refs/heads/master@{#26881}

TBR=machenbach@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/964483002

Cr-Commit-Position: refs/heads/master@{#26882}

BUG=

Review URL: https://codereview.chromium.org/955393002

Cr-Commit-Position: refs/heads/master@{#26881}

We cannot yet detect use-before-declaration in general, because for that we'd
need to analyze the context when compiling. But we can detect an error case
where we first see a use, then a declaration.

For this, I also added end position tracking (needed for error messages) to
VariableProxy.

Note: the position naming is completely inconsistent: start_position &
end_position, position & end_position, pos & end_pos, beg_pos & end_pos, to name
a few. This doesn't fix all of it, but tries to unify towards start_position &
end_position whenever possible w/ minimal changes.

BUG=

Review URL: https://codereview.chromium.org/943543002

Cr-Commit-Position: refs/heads/master@{#26880}

When a field type is a map, it is wrapped in a weak cell upon storing to the descriptor array.

Map::GetFieldType(i) does the unwrapping.

BUG=v8:3877
LOG=N
TEST=cctest/test-heap/Regress3877

Review URL: https://codereview.chromium.org/955063002

Cr-Commit-Position: refs/heads/master@{#26879}