X87: [turbofan] Add an operator to access the parent frame pointer.

X87: [turbofan] Add an operator to access the parent frame pointer.

  port fd8fd05cc5389a44a3d15ace0cf34b43369b758e (r34014)

  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.

BUG=

Committed: https://crrev.com/9727ab7e28400fcc9d40834f875d34cbd89ef026
Cr-Commit-Position: refs/heads/master@{#34064}

[zhengxing.li, 2016-02-17 07:31:05]

zhengxing.li@intel.com changed reviewers:
+ chunyang.dai@intel.com, danno@chromium.org, weiliang.lin@intel.com

[zhengxing.li, 2016-02-17 07:31:06]

PTAL, thanks!

[Weiliang, 2016-02-17 09:11:01]

lgtm

[zhengxing.li, 2016-02-17 09:22:41]

The CQ bit was checked by zhengxing.li@intel.com

[commit-bot: I haz the power, 2016-02-17 09:22:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1705673002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1705673002/1

[commit-bot: I haz the power, 2016-02-17 09:48:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-17 09:48:36]

Description was changed from

==========
X87: [turbofan] Add an operator to access the parent frame pointer.

  port fd8fd05cc5389a44a3d15ace0cf34b43369b758e (r34014)

  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.

BUG=
==========

to

==========
X87: [turbofan] Add an operator to access the parent frame pointer.

  port fd8fd05cc5389a44a3d15ace0cf34b43369b758e (r34014)

  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.

BUG=

Committed: https://crrev.com/9727ab7e28400fcc9d40834f875d34cbd89ef026
Cr-Commit-Position: refs/heads/master@{#34064}
==========

[commit-bot: I haz the power, 2016-02-17 09:48:37]

Patchset 1 (id:??) landed as
https://crrev.com/9727ab7e28400fcc9d40834f875d34cbd89ef026
Cr-Commit-Position: refs/heads/master@{#34064}