[turbofan] Ensure AstGraphBuilder::CheckOsrEntry hits once.

[turbofan] Ensure AstGraphBuilder::CheckOsrEntry hits once.

The predicate in question should only trigger once and hence the stack
height should not be updated incrementally. This puts checks into place
ensuring this holds.

R=bmeurer@chromium.org

Committed: https://crrev.com/f8ed6fb151555f11c0c8396c741758741698aa61
Cr-Commit-Position: refs/heads/master@{#39472}

[Michael Starzinger, 2016-09-16 10:46:32]

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

[commit-bot: I haz the power, 2016-09-16 10:46:34]

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, 2016-09-16 11:09:50]

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

[commit-bot: I haz the power, 2016-09-16 11:09:51]

Dry run: This issue passed the CQ dry run.

[Benedikt Meurer, 2016-09-16 11:41:46]

Remove all the defensive programming! LGTM

[Michael Starzinger, 2016-09-16 11:54:48]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2016-09-16 11:54:57]

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, 2016-09-16 11:57:16]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-16 11:58:04]

Description was changed from

==========
[turbofan] Ensure AstGraphBuilder::CheckOsrEntry hits once.

The predicate in question should only trigger once and hence the stack
height should not be updated incrementally. This puts checks into place
ensuring this holds.

R=bmeurer@chromium.org
==========

to

==========
[turbofan] Ensure AstGraphBuilder::CheckOsrEntry hits once.

The predicate in question should only trigger once and hence the stack
height should not be updated incrementally. This puts checks into place
ensuring this holds.

R=bmeurer@chromium.org

Committed: https://crrev.com/f8ed6fb151555f11c0c8396c741758741698aa61
Cr-Commit-Position: refs/heads/master@{#39472}
==========

[commit-bot: I haz the power, 2016-09-16 11:58:04]

Patchset 1 (id:??) landed as
https://crrev.com/f8ed6fb151555f11c0c8396c741758741698aa61
Cr-Commit-Position: refs/heads/master@{#39472}