libGL MultMatrixd implementation

Change-Id: Ia1bbe00c9538403b59c2960558b94bd4e7327189
Reviewed-on: https://swiftshader-review.googlesource.com/2520
Tested-by: Maxime Grégoire <mgregoire@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>