Reland "Remove V8_HOST_CAN_READ_UNALIGNED and its uses."

Reland "Remove V8_HOST_CAN_READ_UNALIGNED and its uses."

BUG=chromium:412967
LOG=N
R=jkummerow@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=23938

[Yang, 2014-09-15 10:38:50]

yangguo@chromium.org changed reviewers:
+ jkummerow@chromium.org

[Yang, 2014-09-15 10:38:50]

Please take a look. Second patch set includes the fix and test case.

[Jakob Kummerow, 2014-09-15 10:46:48]

LGTM with comment.

https://codereview.chromium.org/571903002/diff/20001/src/utils.h
File src/utils.h (right):

https://codereview.chromium.org/571903002/diff/20001/src/utils.h#newcode686
src/utils.h:686: return memcmp(lhs, rhs, sizeof(*lhs) * chars);
Consider s/sizeof(*lhs) *// because it's guaranteed to be 1 now.

[Yang, 2014-09-15 10:55:05]

Committed patchset #3 (id:40001) manually as 23938 (presubmit successful).