[turbofan] Strength reduction for inline comparisons.

[turbofan] Strength reduction for inline comparisons.

Perform strength reduction on machine operators with inline comparisons:

  CMP & 1 => CMP
  1 & CMP => CMP
  CMP << 31 >> 31 => CMP

Also strength reduce the following constructs:

  x + (0 - y) => x - y
  (0 - y) + x => x - y

R=dcarney@chromium.org

Committed: https://crrev.com/dcf193f18cb76e60bf3fb978093eed93442d0430
Cr-Commit-Position: refs/heads/master@{#26817}

[dcarney, 2015-02-24 12:05:13]

lgtm

[Benedikt Meurer, 2015-02-24 12:05:31]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-02-24 12:05:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/951903003/1

[commit-bot: I haz the power, 2015-02-24 12:26:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-24 12:26:36]

Patchset 1 (id:??) landed as
https://crrev.com/dcf193f18cb76e60bf3fb978093eed93442d0430
Cr-Commit-Position: refs/heads/master@{#26817}