[turbofan] Ensure stackcheck flags do something.

[turbofan] Ensure stackcheck flags do something.

While the intention is to eventually do away with
FLAG_turbo_loop_stackcheck and FLAG_turbo_preprocess_range,
they are useful for the interim we are still testing and
benchmarking the feature.

Committed: https://crrev.com/283d41372936855934e30b6175b933822cc951ea
Cr-Commit-Position: refs/heads/master@{#30399}

[Mircea Trofin, 2015-08-27 00:45:56]

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

[Benedikt Meurer, 2015-08-27 04:36:20]

lgtm

[Mircea Trofin, 2015-08-27 04:39:58]

The CQ bit was checked by mtrofin@chromium.org

[commit-bot: I haz the power, 2015-08-27 04:40:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1314163003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1314163003/1

[commit-bot: I haz the power, 2015-08-27 04:41:26]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-27 04:41:39]

Patchset 1 (id:??) landed as
https://crrev.com/283d41372936855934e30b6175b933822cc951ea
Cr-Commit-Position: refs/heads/master@{#30399}