[turbofan] Use FastNewClosureStub if possible.

[turbofan] Use FastNewClosureStub if possible.

This introduces a JSCreateClosure operator which can be lowered by the
typed pipeline to the aforementioned stub. It also allows for further
optimizations of closure creation.

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/1105513002

Cr-Commit-Position: refs/heads/master@{#28058}