Version 3.26.31.1 (merged r21196)

Fix index register assignment in LoadFieldByIndex for arm, arm64, and mips.

BUG=368243
LOG=N
R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/275103007

git-svn-id: https://v8.googlecode.com/svn/branches/3.26@21286 ce2b1a6d-e550-0410-aec6-3dcde31c8c00