ARM: Allow function inlining with context change.

BUG=none
TEST=none
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/25247002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17019 ce2b1a6d-e550-0410-aec6-3dcde31c8c00