PPC: [turbofan] Add an operator to access the parent frame pointer

PPC: [turbofan] Add an operator to access the parent frame pointer

Port fd8fd05cc5389a44a3d15ace0cf34b43369b758e

Original commit message:
    This functionality is useful for stubs that need to walk the stack. The new
    machine operator, LoadParentFramePointer dosn't force the currently compiling
    method to have a frame in contrast to LoadFramePointer. Instead, it adapts
    accordingly when frame elision is possible, making efficient stack walks
    possible without incurring a performance penalty for small stubs that can
    benefit from frame elision.

R=danno@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Committed: https://crrev.com/163ef0991a84d5f47ab0313e869267017a631506
Cr-Commit-Position: refs/heads/master@{#34049}

[MTBrandyberry, 2016-02-16 21:53:26]

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

[commit-bot: I haz the power, 2016-02-16 21:53:33]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1700323002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1700323002/1

[commit-bot: I haz the power, 2016-02-16 22:14:37]

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

[commit-bot: I haz the power, 2016-02-16 22:14:37]

Dry run: This issue passed the CQ dry run.

[michael_dawson, 2016-02-16 22:19:33]

On 2016/02/16 22:14:37, commit-bot: I haz the power wrote:
> Dry run: This issue passed the CQ dry run.

lgtm

[MTBrandyberry, 2016-02-16 22:19:49]

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

[commit-bot: I haz the power, 2016-02-16 22:19:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1700323002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1700323002/1

[commit-bot: I haz the power, 2016-02-16 22:21:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-16 22:21:48]

Description was changed from

==========
PPC: [turbofan] Add an operator to access the parent frame pointer

Port fd8fd05cc5389a44a3d15ace0cf34b43369b758e

Original commit message:
    This functionality is useful for stubs that need to walk the stack. The new
    machine operator, LoadParentFramePointer dosn't force the currently
compiling
    method to have a frame in contrast to LoadFramePointer. Instead, it adapts
    accordingly when frame elision is possible, making efficient stack walks
    possible without incurring a performance penalty for small stubs that can
    benefit from frame elision.

R=danno@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=
==========

to

==========
PPC: [turbofan] Add an operator to access the parent frame pointer

Port fd8fd05cc5389a44a3d15ace0cf34b43369b758e

Original commit message:
    This functionality is useful for stubs that need to walk the stack. The new
    machine operator, LoadParentFramePointer dosn't force the currently
compiling
    method to have a frame in contrast to LoadFramePointer. Instead, it adapts
    accordingly when frame elision is possible, making efficient stack walks
    possible without incurring a performance penalty for small stubs that can
    benefit from frame elision.

R=danno@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=

Committed: https://crrev.com/163ef0991a84d5f47ab0313e869267017a631506
Cr-Commit-Position: refs/heads/master@{#34049}
==========

[commit-bot: I haz the power, 2016-02-16 22:21:48]

Patchset 1 (id:??) landed as
https://crrev.com/163ef0991a84d5f47ab0313e869267017a631506
Cr-Commit-Position: refs/heads/master@{#34049}