Extend bounds check elimination to constant keys.

Extend bounds check elimination to constant keys.

R=jkummerow@chromium.org
BUG=v8:3367
LOG=N

Committed: https://code.google.com/p/v8/source/detail?r=21672

[Jakob Kummerow, 2014-06-04 11:00:09]

LGTM if you add a test that exercises this code path. (No need to assert
directly that BCE did something, just check that we computed the right result.
Try to create a challenge for the algorithm, e.g. a situation where a bounds
check should fail, and/or where several basic blocks are involved, and/or mix
HAdd and HConstant indices.)

[Yang, 2014-06-04 11:46:11]

On 2014/06/04 11:00:09, Jakob wrote:
> LGTM if you add a test that exercises this code path. (No need to assert
> directly that BCE did something, just check that we computed the right result.
> Try to create a challenge for the algorithm, e.g. a situation where a bounds
> check should fail, and/or where several basic blocks are involved, and/or mix
> HAdd and HConstant indices.)

Added a bunch of test cases as suggested.

[Jakob Kummerow, 2014-06-04 11:48:47]

Thanks! LGTM.

[Yang, 2014-06-04 11:52:24]

Committed patchset #2 manually as r21672 (presubmit successful).