Instead of creating a fresh basic block for the inlined body,
I just simulate the outer environment in the middle of the current
block before updating the current environment to the inlined environment and
emitting the enter-inlined instruction.
Review URL: https://chromiumcodereview.appspot.com/9618052

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10954 ce2b1a6d-e550-0410-aec6-3dcde31c8c00