[turbofan] Split before loops.

[turbofan] Split before loops.

If the range doesn't have calls, but still fails to allocate, try and find a split
position outside a loop.

BUG=

Committed: https://crrev.com/f050c53c9a1ba8adfbb1ab0e41f8dda668666bd7
Cr-Commit-Position: refs/heads/master@{#30580}

[Mircea Trofin, 2015-09-04 07:50:00]

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

[Benedikt Meurer, 2015-09-04 08:22:57]

lgtm

[Mircea Trofin, 2015-09-04 08:23:18]

The CQ bit was checked by mtrofin@chromium.org

[commit-bot: I haz the power, 2015-09-04 08:23:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1301393012/20002
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1301393012/20002

[commit-bot: I haz the power, 2015-09-04 08:28:06]

Committed patchset #3 (id:20002)

[commit-bot: I haz the power, 2015-09-04 08:28:19]

Patchset 3 (id:??) landed as
https://crrev.com/f050c53c9a1ba8adfbb1ab0e41f8dda668666bd7
Cr-Commit-Position: refs/heads/master@{#30580}