This CL implements NumberIsNaN in Torque and removes it from the
CodeStubAssembler. It is currently used in TypedArray.p.sort and
Array.p.sort.

R=jgruber@chromium.org

Change-Id: Iaaa81901f89c0df68997d4501607b302a0449012
Reviewed-on: https://chromium-review.googlesource.com/1092532
Commit-Queue: Simon Zünd <szuend@google.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53611}