Intel: Branch reordering and port arm EmitNumberUntagD() Improvement

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/23872026

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16714 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Add missing factory method for HDebugBreak.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/23619052

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16715 ce2b1a6d-e550-0410-aec6-3dcde31c8c00