[turbofan] Turn Math.clz32 into an inlinable builtin.

[turbofan] Turn Math.clz32 into an inlinable builtin.

R=dcarney@chromium.org, yangguo@chromium.org
BUG=v8:3952
LOG=n

Committed: https://crrev.com/3aa206b86560da94f895625186295bf07a0301d8
Cr-Commit-Position: refs/heads/master@{#27329}

[Benedikt Meurer, 2015-03-20 08:02:32]

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

[Benedikt Meurer, 2015-03-20 08:02:32]

Yang: Please take a look at the general math changes.
Dan: Please review the TurboFan changes.

[dcarney, 2015-03-20 08:12:06]

lgtm

[Yang, 2015-03-20 08:33:29]

On 2015/03/20 08:12:06, dcarney wrote:
> lgtm

lgtm. Though I'm not sure whether we actually care about that counter.

[Benedikt Meurer, 2015-03-20 08:36:28]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-03-20 08:36:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1021183002/1

[Benedikt Meurer, 2015-03-20 08:36:51]

The CQ bit was unchecked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-03-20 08:37:46]

Patchset 1 (id:??) landed as
https://crrev.com/3aa206b86560da94f895625186295bf07a0301d8
Cr-Commit-Position: refs/heads/master@{#27329}