The typing rules for NumberMax and NumberMin didn't properly deal with
-0 up until now, leading to suboptimal typing, i.e. for a simple case
like

  Math.max(Math.round(x), 1)

TurboFan was unable to figure out that the result is definitely going
to be a positive integer in the range [1,inf] or NaN (assuming that
NumberOrOddball feedback is used for the value x).

Bug: v8:8015
Change-Id: I06e14a9c9b0b813eb214ace7749fcc6ab36bb66a
Reviewed-on: https://chromium-review.googlesource.com/1199304
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55570}