Promote objects if semi-space copy fails while scavenging.

BUG=388188
LOG=N
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/351853006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21980 ce2b1a6d-e550-0410-aec6-3dcde31c8c00