GL_INVALID_ENUM is for enum values that are never valid for the function.
GL_INVALID_OPERATION is expected for enum combinations that are not valid.

Change-Id: I43a6cd169303420a680e4cab15683605a8684517
Reviewed-on: https://swiftshader-review.googlesource.com/5094Tested-by: Nicolas Capens <capn@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>