Remove V8_INLINE to prevent C4714 warning under Win64.

BUG=
R=jochen@chromium.org

Review URL: https://codereview.chromium.org/217123004

Patch from Daniel Vogelheim <vogelheim@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20412 ce2b1a6d-e550-0410-aec6-3dcde31c8c00