Use register parameters in ElementsTransitionGenerator.

Use register parameters in ElementsTransitionGenerator.

R=mstarzinger@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=22384

[mvstanton, 2014-07-14 10:49:12]

Hi Michael, here is the change we discussed. On ARM64 and ARM, I fully
parameterized the registers in ElementsTransitionGenerator, in preparation for a
change to those registers due to StoreIC changes.

On ia32 and x64, I was content to ASSERT that the input parameters are
particular fixed registers. No change is coming there for StoreIC.

I unified the implementation of AreAliased across 3 platforms. I could go
further, and probably get a platform independent implementation but arm64 does
things a bit differently. Your call if I should make additional changes.

Thanks for the help!
--Michael

[Michael Starzinger, 2014-07-14 11:46:22]

LGTM.

[mvstanton, 2014-07-14 15:03:55]

Committed patchset #1 manually as r22384 (tree was closed).