Since v8:13964, flags is uint32, so always use cmp on ARM.

Review URL: https://chromiumcodereview.appspot.com/12693020

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@13967 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Add instrumentation to track down Code::CopyFrom crasher.

R=jkummerow@chromium.org
BUG=chromium:196330

Review URL: https://codereview.chromium.org/12916005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@13968 ce2b1a6d-e550-0410-aec6-3dcde31c8c00