[turbofan] Initial version of branch cloning.

[turbofan] Initial version of branch cloning.

This implements a special case of block cloning to recognize constructs like

 if (a ? b : c) { ... }

that happen to be generated by Emscripten quite often.

Committed: https://crrev.com/0882d3ff81d460717cb04670378b92ce0444ce80
Cr-Commit-Position: refs/heads/master@{#26808}

[Benedikt Meurer, 2015-02-24 07:10:04]

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

[Benedikt Meurer, 2015-02-24 07:10:04]

PTAL

[Sven Panne, 2015-02-24 07:39:34]

The CQ bit was checked by svenpanne@chromium.org

[Sven Panne, 2015-02-24 07:39:34]

lgtm

[commit-bot: I haz the power, 2015-02-24 07:40:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/947963002/20001

[commit-bot: I haz the power, 2015-02-24 07:40:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/947963002/20001

[commit-bot: I haz the power, 2015-02-24 07:41:27]

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

[commit-bot: I haz the power, 2015-02-24 07:41:28]

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

[commit-bot: I haz the power, 2015-02-24 07:41:29]

Failed to apply the patch.

[commit-bot: I haz the power, 2015-02-24 07:41:30]

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

[commit-bot: I haz the power, 2015-02-24 07:41:33]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-24 07:41:44]

Patchset 2 (id:??) landed as
https://crrev.com/0882d3ff81d460717cb04670378b92ce0444ce80
Cr-Commit-Position: refs/heads/master@{#26808}