[turbofan] Don't try to push JSToNumber into phis early.

[turbofan] Don't try to push JSToNumber into phis early.

This should not be done during typed lowering, but should be part of a
dedicated truncation/conversion analysis.

R=jarin@chromium.org

Committed: https://crrev.com/225f9bf214494ba383adf8411d983ba38237e9e1
Cr-Commit-Position: refs/heads/master@{#28314}

[Benedikt Meurer, 2015-05-08 09:13:17]

Hey Jaro,

This is the first CL on the typed array asm.js lowering fix that we talked
about. Please take a look.

Thanks,
Benedikt

[Jarin, 2015-05-08 09:23:30]

lgtm

[Benedikt Meurer, 2015-05-08 09:24:06]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-05-08 09:24:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1132773002/1

[commit-bot: I haz the power, 2015-05-08 09:35:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-08 09:35:15]

Patchset 1 (id:??) landed as
https://crrev.com/225f9bf214494ba383adf8411d983ba38237e9e1
Cr-Commit-Position: refs/heads/master@{#28314}