Converts FastNewClosureStub from a Hydrogen to a TurboFan code stub.
The plan is to start using this in the Interpreter CreateClosure
bytecode handler (in a follow-up CL).

BUG=v8:4280

Review-Url: https://codereview.chromium.org/2100883003
Cr-Commit-Position: refs/heads/master@{#37429}