X87: Switch CallConstructStub to take new.target in register.

X87: Switch CallConstructStub to take new.target in register.

original commit message:

    This changes the calling convention of the CallConstructStub to take
    the original constructor (i.e. new.target in JS-speak) in a register
    instead of magically via the operand stack. For optimizing compilers
    the operand stack doesn't exist, hence cannot be peeked into.

BUG=

Committed: https://crrev.com/c6d42c7d6c60f0651ee993f2de5b59f37225732a
Cr-Commit-Position: refs/heads/master@{#29695}

[chunyang.dai, 2015-07-16 08:17:50]

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

[chunyang.dai, 2015-07-16 08:17:51]

PTAL

[Weiliang, 2015-07-16 08:26:27]

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

[Weiliang, 2015-07-16 08:26:28]

lgtm

[commit-bot: I haz the power, 2015-07-16 08:26:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1235273003/1

[commit-bot: I haz the power, 2015-07-16 08:52:58]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-16 08:53:18]

Patchset 1 (id:??) landed as
https://crrev.com/c6d42c7d6c60f0651ee993f2de5b59f37225732a
Cr-Commit-Position: refs/heads/master@{#29695}