It turns out that this function didn't make much sense since
ReduceTypeOf already dispatches on the type of the input.

Bug: v8:7790
Change-Id: Ib02149db78e507500bbe79e16380ea7de8c4abfe
Reviewed-on: https://chromium-review.googlesource.com/1219329
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55854}