[turbofan] Lower more number operations to integer operations.

[turbofan] Lower more number operations to integer operations.

If the typer was able to prove that a NumberAdd/Sub/Mul/Div/Mod always
produces a Signed32/Unsigned32 value, and the inputs are
Signed32/Unsigned32, we can lower the node to the corresponding integer
operation instead, no matter what the uses are.

R=jarin@chromium.org

Committed: https://crrev.com/225a6adc2ad8f971195394fa850e9cc7eafd6ed7
Cr-Commit-Position: refs/heads/master@{#28393}

[Benedikt Meurer, 2015-05-13 12:32:48]

Hey Jaro,

The simplified lowering patch. Please take a look.

Thanks,
Benedikt

[Jarin, 2015-05-13 12:35:14]

lgtm

[Benedikt Meurer, 2015-05-13 12:35:24]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-05-13 12:35:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1140933002/1

[commit-bot: I haz the power, 2015-05-13 12:54:00]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-13 12:54:15]

Patchset 1 (id:??) landed as
https://crrev.com/225a6adc2ad8f971195394fa850e9cc7eafd6ed7
Cr-Commit-Position: refs/heads/master@{#28393}