Implement code generation for conditional expressions and regexp

Implement code generation for conditional expressions and regexp
literals.  Regexp literals will not really work before we can
bootstrap, but the right code is being called with the right
arguments.

Finish implementation of object literals.  We can now call through the
StoreIC_Miss stub into the runtime system to do stores.

Restore comment that I accidentally removed in my last commit.
Review URL: http://codereview.chromium.org/140068

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2244 ce2b1a6d-e550-0410-aec6-3dcde31c8c00