Version 3.26.27.1 (merged r21024)

MIPS: Revert r20974, r20991: Unify and simplify the FastCloneShallowArrayStub.

TBR=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/260073012

git-svn-id: https://v8.googlecode.com/svn/trunk@21048 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/trunk' into trunk