Version 3.28.13.1 (merged r22168, r22170, r22174)

This corresponds to 3.28.9.1, with r22174 added.

MIPS: KeyedLoadIC should have same register spec as LoadIC.

MIPS: Clean up the global object naming madness.

One of the fast cases in JSObject::MigrateFastToFast() should not be taken if the number of fields did not change.

BUG=chromium:390918
LOG=N
TBR=danno@chromium.org

Review URL: https://codereview.chromium.org/368403002

git-svn-id: https://v8.googlecode.com/svn/trunk@22218 ce2b1a6d-e550-0410-aec6-3dcde31c8c00