PPC: [interpreter] First implementation of stack unwinding.

PPC: [interpreter] First implementation of stack unwinding.

Port 0b3066b8f5d914bb1a8c5dd0404a866d389d7798

Original commit message:
    This implements a first prototype of stack unwinding for interpreted
    frames. The unwinding machinery performs a range-based lookup in the
    given handler table and potentially continues dispatching at the handler
    offset. Note that this does not yet correctly restore the context to the
    correct value when the handler is being entered.

R=mstarzinger@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:4674
LOG=n

Committed: https://crrev.com/637cbeeb1287b08fdc5d6c039fae7ba48eded842
Cr-Commit-Position: refs/heads/master@{#33418}

[MTBrandyberry, 2016-01-20 20:03:39]

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

[commit-bot: I haz the power, 2016-01-20 20:03:45]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1612593002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1612593002/1

[Michael Starzinger, 2016-01-20 20:12:15]

LGTM. Thanks!

[commit-bot: I haz the power, 2016-01-20 20:32:40]

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

[commit-bot: I haz the power, 2016-01-20 20:32:40]

Dry run: This issue passed the CQ dry run.

[MTBrandyberry, 2016-01-20 20:35:27]

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

[commit-bot: I haz the power, 2016-01-20 20:35:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1612593002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1612593002/1

[commit-bot: I haz the power, 2016-01-20 20:36:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-20 20:37:45]

Description was changed from

==========
PPC: [interpreter] First implementation of stack unwinding.

Port 0b3066b8f5d914bb1a8c5dd0404a866d389d7798

Original commit message:
    This implements a first prototype of stack unwinding for interpreted
    frames. The unwinding machinery performs a range-based lookup in the
    given handler table and potentially continues dispatching at the handler
    offset. Note that this does not yet correctly restore the context to the
    correct value when the handler is being entered.

R=mstarzinger@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=v8:4674
LOG=n
==========

to

==========
PPC: [interpreter] First implementation of stack unwinding.

Port 0b3066b8f5d914bb1a8c5dd0404a866d389d7798

Original commit message:
    This implements a first prototype of stack unwinding for interpreted
    frames. The unwinding machinery performs a range-based lookup in the
    given handler table and potentially continues dispatching at the handler
    offset. Note that this does not yet correctly restore the context to the
    correct value when the handler is being entered.

R=mstarzinger@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=v8:4674
LOG=n

Committed: https://crrev.com/637cbeeb1287b08fdc5d6c039fae7ba48eded842
Cr-Commit-Position: refs/heads/master@{#33418}
==========

[commit-bot: I haz the power, 2016-01-20 20:37:46]

Patchset 1 (id:??) landed as
https://crrev.com/637cbeeb1287b08fdc5d6c039fae7ba48eded842
Cr-Commit-Position: refs/heads/master@{#33418}