Remove unused StubType's, freeing 2 bits in Code objects.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/75973005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17867 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix compilation.

R=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/61163007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17868 ce2b1a6d-e550-0410-aec6-3dcde31c8c00