[es6] Fix return checking in derived constructors

In a derived class constructor in case undefined is returned, we
should return the receiver. If the return is any other value type
we should throw a TypeError.

BUG=v8:4061
LOG=N
R=dslomov@chromium.org, adamk@chromium.org

Review URL: https://codereview.chromium.org/1107203002

Cr-Commit-Position: refs/heads/master@{#28114}