The fast-path of Number.isInteger and Number.isFinite
both returned true for (-)INFINITY, because kInteger
in the type cache includes both infinities. This CL
uses kSafeInteger range to statically optimize those
two operators.

Bug: chromium:823151, chromium:823100
Change-Id: Icab7f305e8c38f25a4b34b88414f0b515bd7a0fb
Reviewed-on: https://chromium-review.googlesource.com/968201Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52010}