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=
Review URL: https://codereview.chromium.org/
1135233003
Cr-Commit-Position: refs/heads/master@{#28469}