MultiTexCoords and TexCoords register index and type declaration

Change-Id: I84eb7dad045f4fe1e238b016a69cd268bb5ff1d2
Reviewed-on: https://swiftshader-review.googlesource.com/3726
Reviewed-by: Maxime Grégoire <mgregoire@google.com>
Tested-by: Maxime Grégoire <mgregoire@google.com>
1 file changed