[turbofan] Fix indirect escapes in escape analysis.

[turbofan] Fix indirect escapes in escape analysis.

This makes sure we only replace load operations for fields on virtual
objects. Even though data flow information for non-virtual (escaping)
allocations is available, it might be inaccurate in certain situations
where object state hasn't been cleared.

R=jarin@chromium.org
TEST=mjsunit/compiler/regress-escape-analysis-indirect

Committed: https://crrev.com/437a33efd244f86a82e476135f4b0a77f11b83ad
Cr-Commit-Position: refs/heads/master@{#39776}

[Michael Starzinger, 2016-09-26 16:23:51]

The CQ bit was checked by mstarzinger@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-26 16:23:59]

Dry run: 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, 2016-09-26 16:47:14]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-09-26 16:47:14]

Dry run: This issue passed the CQ dry run.

[Jarin, 2016-09-27 14:35:30]

lgtm. Thanks!

[Michael Starzinger, 2016-09-27 14:36:10]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2016-09-27 14:36:25]

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, 2016-09-27 14:53:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-27 14:53:24]

Description was changed from

==========
[turbofan] Fix indirect escapes in escape analysis.

This makes sure we only replace load operations for fields on virtual
objects. Even though data flow information for non-virtual (escaping)
allocations is available, it might be inaccurate in certain situations
where object state hasn't been cleared.

R=jarin@chromium.org
TEST=mjsunit/compiler/regress-escape-analysis-indirect
==========

to

==========
[turbofan] Fix indirect escapes in escape analysis.

This makes sure we only replace load operations for fields on virtual
objects. Even though data flow information for non-virtual (escaping)
allocations is available, it might be inaccurate in certain situations
where object state hasn't been cleared.

R=jarin@chromium.org
TEST=mjsunit/compiler/regress-escape-analysis-indirect

Committed: https://crrev.com/437a33efd244f86a82e476135f4b0a77f11b83ad
Cr-Commit-Position: refs/heads/master@{#39776}
==========

[commit-bot: I haz the power, 2016-09-27 14:53:25]

Patchset 1 (id:??) landed as
https://crrev.com/437a33efd244f86a82e476135f4b0a77f11b83ad
Cr-Commit-Position: refs/heads/master@{#39776}