Version 3.29.35.1 (merged r23567)

Revert "More aggressive reuse of spill slots in the register allocator."

BUG=409604
LOG=N
TBR=jarin@chromium.org

Review URL: https://codereview.chromium.org/525413002

git-svn-id: https://v8.googlecode.com/svn/trunk@23571 ce2b1a6d-e550-0410-aec6-3dcde31c8c00