This fixes undefined behavior in the arithmetic negation operation by
switching to a branch-free implementation.

R=clemensh@chromium.org
TEST=unittests/MachineOperatorReducerTest.Int32DivWithConstant

Change-Id: I518f0e4343fc331607b8bbeefd2bb06285621fe6
Reviewed-on: https://chromium-review.googlesource.com/584870Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46905}