X87: [turbofan] Remove the no-context hack for JSToNumber.

X87: [turbofan] Remove the no-context hack for JSToNumber.

port d211608a3eb7ef3da4d04fd4f5a8540dedbd1faa

original commit message:
  [turbofan] Remove the no-context hack for JSToNumber.

  The ToNumberStub is now able to handle all plain primitives (Numbers,
  Booleans, Null, Undefined and Strings) without context access.

BUG=

Committed: https://crrev.com/ab7622a094058d62e14f5543fe099d6dd527f501
Cr-Commit-Position: refs/heads/master@{#25833}

[chunyang.dai, 2014-12-16 06:09:58]

chunyang.dai@intel.com changed reviewers:
+ bmeurer@chromium.org, weiliang.lin@intel.com

[chunyang.dai, 2014-12-16 06:10:12]

WL.
PTAL.
thanks

[Weiliang, 2014-12-16 06:19:51]

lgtm

[chunyang.dai, 2014-12-16 06:45:30]

The CQ bit was checked by chunyang.dai@intel.com

[commit-bot: I haz the power, 2014-12-16 06:46:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/810683002/1

[commit-bot: I haz the power, 2014-12-16 07:13:59]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-17 10:13:54]

Patchset 1 (id:??) landed as
https://crrev.com/ab7622a094058d62e14f5543fe099d6dd527f501
Cr-Commit-Position: refs/heads/master@{#25833}