X87: Resolve references to "this" the same way as normal variables

X87: Resolve references to "this" the same way as normal variables

port bd56d279b612f92d2d1d25f92d32fe7f42a455ca (R28340).

original commit message:

    Make the parser handle references to "this" as unresolved variables, so the
    same logic as for the rest of function parameters is used for the receiver.
    Minor additions to the code generation handle copying the receiver to the
    context, along with the rest of the function parameters.

    Based on work by Adrian Perez de Castro <aperez@igalia.com>;.

BUG=

Committed: https://crrev.com/6eea252463648d81cf3ae128e6f0d5f815a108bb
Cr-Commit-Position: refs/heads/master@{#28390}

[chunyang.dai, 2015-05-13 10:26:57]

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

[chunyang.dai, 2015-05-13 10:26:57]

PTAL.

[Weiliang, 2015-05-13 10:37:07]

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

[Weiliang, 2015-05-13 10:37:07]

lgtm

[commit-bot: I haz the power, 2015-05-13 10:37:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1136953010/1

[commit-bot: I haz the power, 2015-05-13 11:18:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-13 11:19:04]

Patchset 1 (id:??) landed as
https://crrev.com/6eea252463648d81cf3ae128e6f0d5f815a108bb
Cr-Commit-Position: refs/heads/master@{#28390}