Avoid starting a new basic block when inlining a function.
Avoid starting a new basic block when inlining a function.

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: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@10954 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh