Handlify PropertyAttribute lookups.

R=ishell@chromium.org

Review URL: https://codereview.chromium.org/197813004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19891 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Only call to LogSymbol when needed.

R=marja@chromium.org

BUG=

Review URL: https://codereview.chromium.org/198903002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19892 ce2b1a6d-e550-0410-aec6-3dcde31c8c00