In HObjectAccess::ForField pass property name down into HObjectAccess for in-object fields.

This makes hydrogen.cfg more readable (property name becomes visible in addition to offset).

R=mvstanton@chromium.org
BUG=

Review URL: https://codereview.chromium.org/132923004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18781 ce2b1a6d-e550-0410-aec6-3dcde31c8c00