Out of bounds memory access in TestJSArrayForAllocationSiteInfo.

The function intended to check the map pointer of an AllocationSiteInfo object, but neglected to
subtract an offset to do so.

BUG=169928

Review URL: https://codereview.chromium.org/11931037

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@13444 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Remove unused GlobalHandles::IterateWeakRoots()

BUG=

Review URL: https://codereview.chromium.org/11969037
Patch from Kentaro Hara <haraken@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@13445 ce2b1a6d-e550-0410-aec6-3dcde31c8c00