X87: Make --always-opt also optimize top-level code

X87: Make --always-opt also optimize top-level code

port 2d281e71ac49058ef5696f4255ff1fa30796bc5e (r27633)

original commit message:

    Make --always-opt also optimize top-level code.

    This enables eager optimization of top-level code with TurboFan and
    extends test coverage by triggering it with the --always-opt flag.
    Script contexts are now also properly allocated in TurboFan.

BUG=

Committed: https://crrev.com/8fe72d6ff5d34694fe2b7cc075e6dcfaca1fb201
Cr-Commit-Position: refs/heads/master@{#27693}

[chunyang.dai, 2015-04-09 09:05:08]

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

[chunyang.dai, 2015-04-09 09:05:09]

PTAL

[Weiliang, 2015-04-09 09:05:44]

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

[Weiliang, 2015-04-09 09:05:45]

lgtm

[commit-bot: I haz the power, 2015-04-09 09:06:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1077523002/1

[commit-bot: I haz the power, 2015-04-09 09:30:52]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-09 09:31:04]

Patchset 1 (id:??) landed as
https://crrev.com/8fe72d6ff5d34694fe2b7cc075e6dcfaca1fb201
Cr-Commit-Position: refs/heads/master@{#27693}