X87: Optimize the typeof operator.

X87: Optimize the typeof operator.

port 7798548a8f2ef14e8320cc42effa86f0eb8e4294 (r28260)

original commit message:

    typeof was implemented as a runtime function. Calling it in
    optimized code with a non-constant input becomes burdensome.

BUG=

Committed: https://crrev.com/4b0565262ab09411d85ee734bd1ae392bf2905c4
Cr-Commit-Position: refs/heads/master@{#28279}

[chunyang.dai, 2015-05-07 02:59:06]

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

[chunyang.dai, 2015-05-07 02:59:06]

PTAL

[Weiliang, 2015-05-07 03:37:36]

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

[Weiliang, 2015-05-07 03:37:36]

lgtm

[commit-bot: I haz the power, 2015-05-07 03:38:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1124263005/1

[commit-bot: I haz the power, 2015-05-07 04:01:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-07 04:01:57]

Patchset 1 (id:??) landed as
https://crrev.com/4b0565262ab09411d85ee734bd1ae392bf2905c4
Cr-Commit-Position: refs/heads/master@{#28279}