PPC: [turbofan] Run everything after representation selection concurrently.

PPC: [turbofan] Run everything after representation selection concurrently.

Port d1b3d426ceae45e13ccf30cd4ac6e99e2bb8baf6

Original commit message:

    Further refactor the pipeline to even run the first scheduler (part of
    the effect control linearization) concurrently. This temporarily
    disables most of the write barrier elimination, but we will get back to
    that later.

    Drive-by-fix: Remove the dead code from ChangeLowering, and stack
    allocate the Typer in the pipeline. Also migrate the AllocateStub to a
    native code builtin, so that we have the code object + a handle to it
    available all the time.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=v8:4969
LOG=N

Committed: https://crrev.com/98b074cb41fa9875c0dc66f82447e2c04cd9ac27
Cr-Commit-Position: refs/heads/master@{#35938}

[JaideepBajwa, 2016-05-01 20:41:28]

PTAL

[MTBrandyberry, 2016-05-02 13:59:42]

lgtm

[JaideepBajwa, 2016-05-02 14:20:54]

The CQ bit was checked by bjaideep@ca.ibm.com

[commit-bot: I haz the power, 2016-05-02 14:20:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1941613002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1941613002/1

[commit-bot: I haz the power, 2016-05-02 14:51:46]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-02 14:53:51]

Description was changed from

==========
PPC: [turbofan] Run everything after representation selection concurrently.

Port d1b3d426ceae45e13ccf30cd4ac6e99e2bb8baf6

Original commit message:

    Further refactor the pipeline to even run the first scheduler (part of
    the effect control linearization) concurrently. This temporarily
    disables most of the write barrier elimination, but we will get back to
    that later.

    Drive-by-fix: Remove the dead code from ChangeLowering, and stack
    allocate the Typer in the pipeline. Also migrate the AllocateStub to a
    native code builtin, so that we have the code object + a handle to it
    available all the time.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=v8:4969
LOG=N
==========

to

==========
PPC: [turbofan] Run everything after representation selection concurrently.

Port d1b3d426ceae45e13ccf30cd4ac6e99e2bb8baf6

Original commit message:

    Further refactor the pipeline to even run the first scheduler (part of
    the effect control linearization) concurrently. This temporarily
    disables most of the write barrier elimination, but we will get back to
    that later.

    Drive-by-fix: Remove the dead code from ChangeLowering, and stack
    allocate the Typer in the pipeline. Also migrate the AllocateStub to a
    native code builtin, so that we have the code object + a handle to it
    available all the time.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=v8:4969
LOG=N

Committed: https://crrev.com/98b074cb41fa9875c0dc66f82447e2c04cd9ac27
Cr-Commit-Position: refs/heads/master@{#35938}
==========

[commit-bot: I haz the power, 2016-05-02 14:53:52]

Patchset 1 (id:??) landed as
https://crrev.com/98b074cb41fa9875c0dc66f82447e2c04cd9ac27
Cr-Commit-Position: refs/heads/master@{#35938}