Fix tautological expressions.

Bug 15387371

Change-Id: I01bf5327f205bf646c51c1bb06560448a09f6c4a
Reviewed-on: https://swiftshader-review.googlesource.com/4526
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
5 files changed