X87: Remove frame pointer from StackHandler.

X87: Remove frame pointer from StackHandler.

port 36e69a916f2a88664887d2b62f0eaf8400edb182 (r27115)

original commit message:

 This reduces the size of the StackHandler by yet another word. We no
 longer need to keep track of the frame pointer, as the stack walk will
 be able to recalculate it.

BUG=

Committed: https://crrev.com/c1cf472f8cd16e827d6c95f7a045f689bcac7be7
Cr-Commit-Position: refs/heads/master@{#27357}

[chunyang.dai, 2015-03-23 08:57:55]

chunyang.dai@intel.com changed reviewers:
+ weiliang.lin@intel.com

[chunyang.dai, 2015-03-23 08:57:55]

PTAL.

[Weiliang, 2015-03-23 09:03:50]

The CQ bit was checked by weiliang.lin@intel.com

[Weiliang, 2015-03-23 09:03:51]

lgtm

[commit-bot: I haz the power, 2015-03-23 09:04:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1030563002/1

[commit-bot: I haz the power, 2015-03-23 09:23:10]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-23 09:23:24]

Patchset 1 (id:??) landed as
https://crrev.com/c1cf472f8cd16e827d6c95f7a045f689bcac7be7
Cr-Commit-Position: refs/heads/master@{#27357}