[arm] Clean up disabling of sharing code target entries.

[arm] Clean up disabling of sharing code target entries.

This fixes an issue with ful-codegen where code target entries for the OSR
check were being incorrectly shared. We now explicitly disable sharing of code
target constant pool entries for full-codegen and for calls to builtins from
WASM code, using a scope.

BUG=chromium:725743
Review-Url: https://codereview.chromium.org/2922433002
Cr-Commit-Position: refs/heads/master@{#45661}
Committed: https://chromium.googlesource.com/v8/v8/+/6a99238b9004c8e14b7f86734ef071eac8198212

[georgia.kouveli, 2017-06-01 10:39:02]

georgia.kouveli@arm.com changed reviewers:
+ bmeurer@chromium.org, mstarzinger@chromium.org, mvstanton@chromium.org

[Michael Starzinger, 2017-06-01 11:30:16]

LGTM. Thanks!

[georgia.kouveli, 2017-06-01 12:47:30]

The CQ bit was checked by georgia.kouveli@arm.com

[commit-bot: I haz the power, 2017-06-01 12:47:33]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-06-01 13:18:22]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1496321250382500, "parent_rev":
"15691758b300ec1edcf505b2c28ee118356b45ff", "commit_rev":
"6a99238b9004c8e14b7f86734ef071eac8198212"}

[commit-bot: I haz the power, 2017-06-01 13:18:29]

Description was changed from

==========
[arm] Clean up disabling of sharing code target entries.

This fixes an issue with ful-codegen where code target entries for the OSR
check were being incorrectly shared. We now explicitly disable sharing of code
target constant pool entries for full-codegen and for calls to builtins from
WASM code, using a scope.

BUG=chromium:725743
==========

to

==========
[arm] Clean up disabling of sharing code target entries.

This fixes an issue with ful-codegen where code target entries for the OSR
check were being incorrectly shared. We now explicitly disable sharing of code
target constant pool entries for full-codegen and for calls to builtins from
WASM code, using a scope.

BUG=chromium:725743

Review-Url: https://codereview.chromium.org/2922433002
Cr-Commit-Position: refs/heads/master@{#45661}
Committed:
https://chromium.googlesource.com/v8/v8/+/6a99238b9004c8e14b7f86734ef071eac81...
==========

[commit-bot: I haz the power, 2017-06-01 13:18:30]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/6a99238b9004c8e14b7f86734ef071eac81...