Remove dead GeneralizeFieldRepresentation

BUG=
R=ishell@chromium.org

Review URL: https://codereview.chromium.org/668663002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24741 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Drop obsolete misc-intrinsics.h file.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/648643003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24742 ce2b1a6d-e550-0410-aec6-3dcde31c8c00