Added unsigned in and unsigned vectors
to parser.

Change-Id: Ic904f723c5db33d2d2bf432344d8abc3db966c1f
Reviewed-on: https://swiftshader-review.googlesource.com/3103Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>