Ignore constants that have not been initialized. Bug 19331817 Change-Id: Ib2d41e072306e4fb64a6e074705982982c08cdd4 Reviewed-on: https://swiftshader-review.googlesource.com/2111 Reviewed-by: Nicolas Capens <capn@google.com> Tested-by: Nicolas Capens <capn@google.com>