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

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

Port 18619d355192e2699203d12d9ebb9caea107b693

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>;.

R=wingo@igalia.com, dstence@us.ibm.com,  michael_dawson@ca.ibm.com
BUG=

Committed: https://crrev.com/e0ec097b2f49c4c99a2e9490f4b1a09e02abfd4d
Cr-Commit-Position: refs/heads/master@{#28272}

[wingo, 2015-05-06 15:56:43]

lgtm (non-owner)

https://codereview.chromium.org/1129803003/diff/1/src/ppc/lithium-codegen-ppc.cc
File src/ppc/lithium-codegen-ppc.cc (right):

https://codereview.chromium.org/1129803003/diff/1/src/ppc/lithium-codegen-ppc...
src/ppc/lithium-codegen-ppc.cc:122: !info_->is_native() &&
info_->scope()->has_this_declaration()) {
Might want to use info() consistently here

[dstence, 2015-05-06 16:00:35]

lgtm

[MTBrandyberry, 2015-05-06 16:02:28]

The CQ bit was checked by mbrandy@us.ibm.com

[commit-bot: I haz the power, 2015-05-06 16:02:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1129803003/1

[commit-bot: I haz the power, 2015-05-06 16:30:14]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-06 16:30:18]

Patchset 1 (id:??) landed as
https://crrev.com/e0ec097b2f49c4c99a2e9490f4b1a09e02abfd4d
Cr-Commit-Position: refs/heads/master@{#28272}

[MTBrandyberry, 2015-05-07 22:15:11]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1132513005/ by mbrandy@us.ibm.com.

The reason for reverting is: Original commit was reverted..