PPC: [Interpreter] Save and restore dispatch table pointer during calls.

PPC: [Interpreter] Save and restore dispatch table pointer during calls.

Port a2935d63dfc943fbf38602c5ce966e8dcb02307a

Original commmit message:
    Saves and restores the dispatch pointer during calls to enable the debugger to
    switch the dispatch table used by a function during it's execution.

    Also moves the accumulator and context nodes to be Variables so that they will
    be properly merged across branches.

R=rmcilroy@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:4280, v8:4690
LOG=N

Committed: https://crrev.com/c8257c4c793ef3e3c7b28c73aa765559c3b6998c
Cr-Commit-Position: refs/heads/master@{#33962}

[MTBrandyberry, 2016-02-11 23:21:54]

The CQ bit was checked by mbrandy@us.ibm.com to run a CQ dry run

[commit-bot: I haz the power, 2016-02-11 23:22:02]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1688373002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1688373002/1

[commit-bot: I haz the power, 2016-02-11 23:38:06]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-02-11 23:38:07]

Dry run: Try jobs failed on following builders:
  v8_linux64_avx2_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_avx2_rel/builds/...)

[MTBrandyberry, 2016-02-12 14:27:49]

The CQ bit was checked by mbrandy@us.ibm.com to run a CQ dry run

[commit-bot: I haz the power, 2016-02-12 14:28:01]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1688373002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1688373002/1

[commit-bot: I haz the power, 2016-02-12 15:14:45]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-02-12 15:14:46]

Dry run: This issue passed the CQ dry run.

[michael_dawson, 2016-02-12 23:08:28]

On 2016/02/12 15:14:46, commit-bot: I haz the power wrote:
> Dry run: This issue passed the CQ dry run.

lgtm

[MTBrandyberry, 2016-02-12 23:10:37]

The CQ bit was checked by mbrandy@us.ibm.com

[commit-bot: I haz the power, 2016-02-12 23:10:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1688373002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1688373002/1

[commit-bot: I haz the power, 2016-02-12 23:12:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-12 23:13:03]

Description was changed from

==========
PPC: [Interpreter] Save and restore dispatch table pointer during calls.

Port a2935d63dfc943fbf38602c5ce966e8dcb02307a

Original commmit message:
    Saves and restores the dispatch pointer during calls to enable the debugger
to
    switch the dispatch table used by a function during it's execution.

    Also moves the accumulator and context nodes to be Variables so that they
will
    be properly merged across branches.

R=rmcilroy@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=v8:4280,v8:4690
LOG=N
==========

to

==========
PPC: [Interpreter] Save and restore dispatch table pointer during calls.

Port a2935d63dfc943fbf38602c5ce966e8dcb02307a

Original commmit message:
    Saves and restores the dispatch pointer during calls to enable the debugger
to
    switch the dispatch table used by a function during it's execution.

    Also moves the accumulator and context nodes to be Variables so that they
will
    be properly merged across branches.

R=rmcilroy@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=v8:4280,v8:4690
LOG=N

Committed: https://crrev.com/c8257c4c793ef3e3c7b28c73aa765559c3b6998c
Cr-Commit-Position: refs/heads/master@{#33962}
==========

[commit-bot: I haz the power, 2016-02-12 23:13:04]

Patchset 1 (id:??) landed as
https://crrev.com/c8257c4c793ef3e3c7b28c73aa765559c3b6998c
Cr-Commit-Position: refs/heads/master@{#33962}