X87: Simplify pending message object handling.

X87: Simplify pending message object handling.

port d4696c484142c601cbd691ae80164043785a3af7 (r27150)

original commit message:

  This moves the decision whether to report a message or not to when
  the pending exception is propagated instead of trying to preserve the
  decision in a ThreadLocalTop field.

BUG=

Committed: https://crrev.com/f8c4c12728e5f33ed8462b5c90a2d404833cac80
Cr-Commit-Position: refs/heads/master@{#27360}

[chunyang.dai, 2015-03-23 09:44:28]

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

[chunyang.dai, 2015-03-23 09:44:28]

PTAL.

[Weiliang, 2015-03-23 09:49:45]

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

[Weiliang, 2015-03-23 09:49:45]

lgtm

[commit-bot: I haz the power, 2015-03-23 09:49:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1028073002/1

[commit-bot: I haz the power, 2015-03-23 10:21:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-23 10:21:30]

Patchset 1 (id:??) landed as
https://crrev.com/f8c4c12728e5f33ed8462b5c90a2d404833cac80
Cr-Commit-Position: refs/heads/master@{#27360}