[turbofan] Fix test of %_MathClz32 intrinsic.

[turbofan] Fix test of %_MathClz32 intrinsic.

This test will fail once we optimize top-level code, because the
aforementioned intrinsic doesn't perform a NumberToUint32 conversion.

R=titzer@chromium.org
TEST=mjsunit/asm/math-clz32

Committed: https://crrev.com/6c19c79f596ae6872c7b5b2fe2b31ff4f5c8cb51
Cr-Commit-Position: refs/heads/master@{#27524}

[Michael Starzinger, 2015-03-30 14:46:56]

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

[Michael Starzinger, 2015-03-30 14:46:57]

Ben: PTAL.
Benedikt: FYI.

[titzer, 2015-03-30 14:49:03]

LGTM

[Michael Starzinger, 2015-03-30 14:49:30]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2015-03-30 14:49:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1041173002/1

[commit-bot: I haz the power, 2015-03-30 15:10:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-30 15:10:50]

Patchset 1 (id:??) landed as
https://crrev.com/6c19c79f596ae6872c7b5b2fe2b31ff4f5c8cb51
Cr-Commit-Position: refs/heads/master@{#27524}