Port r10166 (b57f3f1a), r10167 (202eada9) and r10170 (5c5c96da).

BUG=
TEST=

Review URL: http://codereview.chromium.org/8822014
Patch from Daniel Kalmar <kalmard@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10214 ce2b1a6d-e550-0410-aec6-3dcde31c8c00