Version 3.27.34.4 (merged r22003)

Grow heap slower if GC freed many global handles.

BUG=263503,305878
LOG=N
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/362993002

git-svn-id: https://v8.googlecode.com/svn/branches/3.27@22157 ce2b1a6d-e550-0410-aec6-3dcde31c8c00