[turbofan] Remove fallback to TurboFan when Crankshaft bails out.

[turbofan] Remove fallback to TurboFan when Crankshaft bails out.

This removes the fallback path in question. Now the {AstNumbering} phase
is the only phase deciding whether Crankshaft is supposed to be disabled
or not. This in turn simplifies reasoning about the paths through the
compilation pipeline. We can decide early whether we want Ignition to
kick in depending on whether Crankshaft is enabled or not.

R=mvstanton@chromium.org,rmcilroy@chromium.org

Committed: https://crrev.com/8bad9474492c96906c57ee625db0e08080455719
Cr-Commit-Position: refs/heads/master@{#37763}

[Michael Starzinger, 2016-07-13 11:19:34]

Description was changed from

==========
[turbofan] Remove fallback to TurboFan when Crankshaft bails out.

This removes the bailout path in question. Now {AstNumber} is the only
phase getting to decide whether Crankshaft is supposed to be disabled.
This in turn simplifies reasoning about paths through the compilation
pipeline. We can decide early whether we want Ignition to kick in
depending on whether Crankshaft is enabled or not.

R=danno@chromium.org,mvstanton@chromium.org,rmcilroy@chromium.org
==========

to

==========
[turbofan] Remove fallback to TurboFan when Crankshaft bails out.

This removes the bailout path in question. Now {AstNumber} is the only
phase getting to decide whether Crankshaft is supposed to be disabled.
This in turn simplifies reasoning about paths through the compilation
pipeline. We can decide early whether we want Ignition to kick in
depending on whether Crankshaft is enabled or not.

R=mvstanton@chromium.org,rmcilroy@chromium.org
==========

[Michael Starzinger, 2016-07-13 11:19:59]

mstarzinger@chromium.org changed reviewers:
+ jkummerow@chromium.org

[Michael Starzinger, 2016-07-13 11:34:44]

Michael & Ross: PTAL.
Danno & Jakob: FYI.

[Michael Starzinger, 2016-07-13 11:37:20]

Description was changed from

==========
[turbofan] Remove fallback to TurboFan when Crankshaft bails out.

This removes the bailout path in question. Now {AstNumber} is the only
phase getting to decide whether Crankshaft is supposed to be disabled.
This in turn simplifies reasoning about paths through the compilation
pipeline. We can decide early whether we want Ignition to kick in
depending on whether Crankshaft is enabled or not.

R=mvstanton@chromium.org,rmcilroy@chromium.org
==========

to

==========
[turbofan] Remove fallback to TurboFan when Crankshaft bails out.

This removes the fallback path in question. Now the {AstNumbering} phase
is the only phase deciding whether Crankshaft is supposed to be disabled
or not. This in turn simplifies reasoning about the paths through the
compilation pipeline. We can decide early whether we want Ignition to
kick in depending on whether Crankshaft is enabled or not.

R=mvstanton@chromium.org,rmcilroy@chromium.org
==========

[rmcilroy, 2016-07-13 14:47:58]

On 2016/07/13 11:34:44, Michael Starzinger wrote:
> Michael & Ross: PTAL.
> Danno & Jakob: FYI.

LGTM (although I don't know the likely impact of this change).

[mvstanton, 2016-07-13 14:51:14]

LGTM

[danno, 2016-07-14 06:00:01]

lgtm

[Michael Starzinger, 2016-07-14 12:38:37]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2016-07-14 12:38:41]

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, 2016-07-14 13:05:20]

Description was changed from

==========
[turbofan] Remove fallback to TurboFan when Crankshaft bails out.

This removes the fallback path in question. Now the {AstNumbering} phase
is the only phase deciding whether Crankshaft is supposed to be disabled
or not. This in turn simplifies reasoning about the paths through the
compilation pipeline. We can decide early whether we want Ignition to
kick in depending on whether Crankshaft is enabled or not.

R=mvstanton@chromium.org,rmcilroy@chromium.org
==========

to

==========
[turbofan] Remove fallback to TurboFan when Crankshaft bails out.

This removes the fallback path in question. Now the {AstNumbering} phase
is the only phase deciding whether Crankshaft is supposed to be disabled
or not. This in turn simplifies reasoning about the paths through the
compilation pipeline. We can decide early whether we want Ignition to
kick in depending on whether Crankshaft is enabled or not.

R=mvstanton@chromium.org,rmcilroy@chromium.org
==========

[commit-bot: I haz the power, 2016-07-14 13:05:21]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-14 13:06:01]

Description was changed from

==========
[turbofan] Remove fallback to TurboFan when Crankshaft bails out.

This removes the fallback path in question. Now the {AstNumbering} phase
is the only phase deciding whether Crankshaft is supposed to be disabled
or not. This in turn simplifies reasoning about the paths through the
compilation pipeline. We can decide early whether we want Ignition to
kick in depending on whether Crankshaft is enabled or not.

R=mvstanton@chromium.org,rmcilroy@chromium.org
==========

to

==========
[turbofan] Remove fallback to TurboFan when Crankshaft bails out.

This removes the fallback path in question. Now the {AstNumbering} phase
is the only phase deciding whether Crankshaft is supposed to be disabled
or not. This in turn simplifies reasoning about the paths through the
compilation pipeline. We can decide early whether we want Ignition to
kick in depending on whether Crankshaft is enabled or not.

R=mvstanton@chromium.org,rmcilroy@chromium.org

Committed: https://crrev.com/8bad9474492c96906c57ee625db0e08080455719
Cr-Commit-Position: refs/heads/master@{#37763}
==========

[commit-bot: I haz the power, 2016-07-14 13:06:02]

Patchset 1 (id:??) landed as
https://crrev.com/8bad9474492c96906c57ee625db0e08080455719
Cr-Commit-Position: refs/heads/master@{#37763}