This extends the existing typer for JS-level comparisons to also be
applied on simplified-level number comparisons. Now that nodes having
such operators are introduced early during graph construction, precise
type information has become more important.

R=jarin@chromium.org
TEST=unittests/TyperTest

Change-Id: Ibcfda36cadf72381b3c63138dd8ad2f6b1f7fbba
Reviewed-on: https://chromium-review.googlesource.com/445879
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43447}