expressions.  Add compilation support in fast mode (optimized for
compilation time and code size).

This breaks one debugger test each on ARM and IA32 (expectedly).
Review URL: http://codereview.chromium.org/160584

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2628 ce2b1a6d-e550-0410-aec6-3dcde31c8c00