[turbofan] Add BoundsCheckMode to ElementAccess.

[turbofan] Add BoundsCheckMode to ElementAccess.

This is currently only used for StoreElement. LoadElement will be
updated to make use of that in a follow-up CL (depends on additional
control input for loads first).

TEST=cctest,mjsunit
R=jarin@chromium.org, mstarzinger@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=24347

[Benedikt Meurer, 2014-09-30 12:54:48]

PTAL

[Jarin, 2014-10-01 07:31:49]

jarin@chromium.org changed reviewers:
+ jarin@chromium.org

[Jarin, 2014-10-01 07:31:51]

lgtm.

https://codereview.chromium.org/617853002/diff/20001/src/compiler/simplified-...
File src/compiler/simplified-operator.h (right):

https://codereview.chromium.org/617853002/diff/20001/src/compiler/simplified-...
src/compiler/simplified-operator.h:49: enum BoundsCheckMode { kNoBoundsCheck,
kIgnoreOutOfBounds };
The kIgnoreOutOfBounds seems a bit confusing - it sounds like we ignore the
out-of-bounds check. How about kSkipStoreIfOutOfBounds?

[Benedikt Meurer, 2014-10-01 07:43:09]

Committed patchset #4 (id:40002) manually as 24347.