[turbofan] Validation for deferred->hot transition edges

[turbofan] Validation for deferred->hot transition edges

Validate that the transition from deferred to hot happens through a
deferred block with one successor. This is needed for frame elision: if
we need to deconstruct the frame on the deferred path, this extra block
offers that location.

A precondition for this validation is that the sequence is in split edge
form.

BUG=

Committed: https://crrev.com/66c6cadc4d1d4aab55c7a76acde791195ada100f
Cr-Commit-Position: refs/heads/master@{#35015}

[Mircea Trofin, 2016-03-18 16:57:42]

Description was changed from

==========
[turbofan] Validation for deferred->hot transition edges

BUG=
==========

to

==========
[turbofan] Validation for deferred->hot transition edges

Validate that the transition from deferred to hot happens through a 
deferred block with one successor. This is needed for frame elision: if
we need to deconstruct the frame on the deferred path, this extra block
offers that location.

A precondition for this validation is that the sequence is in split edge
form. 

BUG=
==========

[Mircea Trofin, 2016-03-18 16:57:43]

mtrofin@chromium.org changed reviewers:
+ danno@chromium.org

[danno, 2016-03-18 17:02:05]

lgtm

[danno, 2016-03-22 17:46:33]

danno@chromium.org changed reviewers:
+ jarin@chromium.org

[danno, 2016-03-22 17:46:33]

lgtm. Adding a compiler OWNER for a real lgtm.

[Mircea Trofin, 2016-03-23 05:54:35]

mtrofin@chromium.org changed reviewers:
+ bmeurer@chromium.org

[Benedikt Meurer, 2016-03-23 06:06:44]

lgtm

[Mircea Trofin, 2016-03-23 07:35:24]

The CQ bit was checked by mtrofin@chromium.org

[commit-bot: I haz the power, 2016-03-23 07:35:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1811213003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1811213003/1

[commit-bot: I haz the power, 2016-03-23 07:37:36]

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

[commit-bot: I haz the power, 2016-03-23 07:37:37]

Try jobs failed on following builders:
  v8_linux64_avx2_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_avx2_rel/builds/...)
  v8_linux_arm_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm_rel/builds/15776)
  v8_linux_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_rel_ng/builds/3371)

[Mircea Trofin, 2016-03-23 07:49:49]

The CQ bit was checked by mtrofin@chromium.org

[commit-bot: I haz the power, 2016-03-23 07:49:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1811213003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1811213003/1

[commit-bot: I haz the power, 2016-03-23 08:11:20]

Description was changed from

==========
[turbofan] Validation for deferred->hot transition edges

Validate that the transition from deferred to hot happens through a 
deferred block with one successor. This is needed for frame elision: if
we need to deconstruct the frame on the deferred path, this extra block
offers that location.

A precondition for this validation is that the sequence is in split edge
form. 

BUG=
==========

to

==========
[turbofan] Validation for deferred->hot transition edges

Validate that the transition from deferred to hot happens through a 
deferred block with one successor. This is needed for frame elision: if
we need to deconstruct the frame on the deferred path, this extra block
offers that location.

A precondition for this validation is that the sequence is in split edge
form. 

BUG=
==========

[commit-bot: I haz the power, 2016-03-23 08:11:21]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-23 08:11:44]

Description was changed from

==========
[turbofan] Validation for deferred->hot transition edges

Validate that the transition from deferred to hot happens through a 
deferred block with one successor. This is needed for frame elision: if
we need to deconstruct the frame on the deferred path, this extra block
offers that location.

A precondition for this validation is that the sequence is in split edge
form. 

BUG=
==========

to

==========
[turbofan] Validation for deferred->hot transition edges

Validate that the transition from deferred to hot happens through a
deferred block with one successor. This is needed for frame elision: if
we need to deconstruct the frame on the deferred path, this extra block
offers that location.

A precondition for this validation is that the sequence is in split edge
form.

BUG=

Committed: https://crrev.com/66c6cadc4d1d4aab55c7a76acde791195ada100f
Cr-Commit-Position: refs/heads/master@{#35015}
==========

[commit-bot: I haz the power, 2016-03-23 08:11:45]

Patchset 1 (id:??) landed as
https://crrev.com/66c6cadc4d1d4aab55c7a76acde791195ada100f
Cr-Commit-Position: refs/heads/master@{#35015}