Unify deoptimizer for JavaScript frames.

This unifies the translation of an optimized frame to a full JavaScript
frame. Only the frame's context and fp register as well as alignment
padding are different on each architecture and can be factored out.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/14843020

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14715 ce2b1a6d-e550-0410-aec6-3dcde31c8c00