ESSL has undefined behavior when the integer modulus operator is used
on negative operands. Generate a warning and fold the result to zero
in this case.

In case the minimum representable signed integer is divided by -1, the
result is defined to be either the maximum or minimum representable
value. We choose to fold the calculation to the maximum representable
value in this case.

BUG=angleproject:1537
TEST=angle_unittests

Change-Id: I57fac6b54a3553b7a0f0e36cc6ba0ed59a88eea9
Reviewed-on: https://chromium-review.googlesource.com/390251Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>