[turbofan] Right hand side of shifts needs ToUint32.

[turbofan] Right hand side of shifts needs ToUint32.

Currently we lower shifts directly to machine operators, and add an
appropriate Word32And to implement the & 0x1F operation on the right
hand side required by the specification. However for Word32And we assume
Int32 in simplified lowering, which is basically changes the right hand
side bit interpretation for the shifts from Uint32 to Int32, which is
obviously wrong. So now we represent that explicitly by proper
simplified operators for the shifts, which are lowered to machine in
simplified lowering.

R=jarin@chromium.org

Committed: https://crrev.com/5f288c201c37375ffe442f6e31ca6a4f36c3496f
Cr-Commit-Position: refs/heads/master@{#29465}

[Benedikt Meurer, 2015-07-03 10:53:03]

Hey Jaro,

The fix for the simplified lowering bug that popped up today.
Please take a look.

Thanks,
Benedikt

[Jarin, 2015-07-03 10:57:25]

lgtm

[Jarin, 2015-07-03 10:57:30]

The CQ bit was checked by jarin@chromium.org

[commit-bot: I haz the power, 2015-07-03 10:57:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1213803008/1

[commit-bot: I haz the power, 2015-07-03 11:42:00]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-03 11:42:09]

Patchset 1 (id:??) landed as
https://crrev.com/5f288c201c37375ffe442f6e31ca6a4f36c3496f
Cr-Commit-Position: refs/heads/master@{#29465}