Redirection to the interpreter is removed from mjsunit tests. Hence the
runtime function will always return 0.
This CL removes the runtime function and the respective method from the
interpreter.

R=thibaudm@chromium.org

Bug: v8:10389
Change-Id: Ia17bebf3992f42a17a9c1b385ecdc2f2e3061b65
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2164794
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67447}