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

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

port 06a792b7cc2db33ffce7244c044a9c05afbb6116 (r28263).

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/c3529ce50158546e2f2c25ee888e7e0170a488f1
Cr-Commit-Position: refs/heads/master@{#28278}

[chunyang.dai, 2015-05-07 02:59:34]

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

[chunyang.dai, 2015-05-07 02:59:35]

PTAL>

[Weiliang, 2015-05-07 03:37:49]

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

[Weiliang, 2015-05-07 03:37:50]

lgtm

[commit-bot: I haz the power, 2015-05-07 03:38:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1124393002/1

[commit-bot: I haz the power, 2015-05-07 04:00:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-07 04:00:16]

Patchset 1 (id:??) landed as
https://crrev.com/c3529ce50158546e2f2c25ee888e7e0170a488f1
Cr-Commit-Position: refs/heads/master@{#28278}