[turbofan] add non fixed slot constraint to register allocator

[turbofan] add non fixed slot constraint to register allocator

R=jarin@chromium.org

BUG=

Committed: https://crrev.com/0a835afb29eedfc266ecb230cf27b8211b1d0b06
Cr-Commit-Position: refs/heads/master@{#27373}

[dcarney, 2015-03-23 09:27:36]

dcarney@chromium.org changed reviewers:
+ jarin@chromium.org

[dcarney, 2015-03-23 09:27:47]

ptal

[Jarin, 2015-03-23 10:38:01]

ouch, my eyes! lgtm (with eyes closed).

[dcarney, 2015-03-23 12:37:57]

The CQ bit was checked by dcarney@chromium.org

[commit-bot: I haz the power, 2015-03-23 12:38:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1018853003/180001

[commit-bot: I haz the power, 2015-03-23 12:58:58]

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

[commit-bot: I haz the power, 2015-03-23 12:58:59]

Try jobs failed on following builders:
  v8_linux_arm64_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm64_rel/builds/4104)

[dcarney, 2015-03-23 15:39:56]

The CQ bit was checked by dcarney@chromium.org

[dcarney, 2015-03-23 15:39:57]

The patchset sent to the CQ was uploaded after l-g-t-m from jarin@chromium.org
Link to the patchset: https://codereview.chromium.org/1018853003/#ps200001
(title: " ")

[commit-bot: I haz the power, 2015-03-23 15:40:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1018853003/200001

[commit-bot: I haz the power, 2015-03-23 16:03:18]

Committed patchset #11 (id:200001)

[commit-bot: I haz the power, 2015-03-23 16:03:28]

Patchset 11 (id:??) landed as
https://crrev.com/0a835afb29eedfc266ecb230cf27b8211b1d0b06
Cr-Commit-Position: refs/heads/master@{#27373}