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

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

port 1efc1e4f7a3d30d5225e9d5cb2585cad7cb17099 (r28458).

original commit message:

  This reapplies https://codereview.chromium.org/1136073002, along with
    the followups:

      Remove Scope::scope_uses_this_ flag
      https://codereview.chromium.org/1128963005

    and

      PPC: Resolve references to "this" the same way as normal variables
      https://codereview.chromium.org/1134073003

BUG=

Committed: https://crrev.com/dec2619a187623d7dafa0e390cef18efe0f6f653
Cr-Commit-Position: refs/heads/master@{#28469}

[chunyang.dai, 2015-05-19 09:21:00]

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

[chunyang.dai, 2015-05-19 09:21:00]

PTAL

[Weiliang, 2015-05-19 09:33:46]

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

[Weiliang, 2015-05-19 09:33:46]

lgtm

[commit-bot: I haz the power, 2015-05-19 09:33:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1135233003/1

[commit-bot: I haz the power, 2015-05-19 10:05:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-19 10:05:58]

Patchset 1 (id:??) landed as
https://crrev.com/dec2619a187623d7dafa0e390cef18efe0f6f653
Cr-Commit-Position: refs/heads/master@{#28469}