The generation of the return sequence is now protected from having the constant pool emitted inside of it in both compilers.

BUG=http://code.google.com/p/v8/issues/detail?id=491
TEST=test/mjsunit/regress/regress-491.js
Review URL: http://codereview.chromium.org/362003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3215 ce2b1a6d-e550-0410-aec6-3dcde31c8c00