Note: This is currently only used by yield*, we still need to support it in
other places (such as for-of loops).  It can be used manually of course.

(This CL does not touch the full-codegen implementation of yield* because that
code is already dead.  The yield* desugaring already supports return and doesn't
need to be touched.)

BUG=v8:3566
LOG=y

Review URL: https://codereview.chromium.org/1639343005

Cr-Commit-Position: refs/heads/master@{#33744}