wined3d: Place immediate constants in the same array as global constants.

- move DEF, DEFI, DEFB handling into the register counting pass
- keep track of defined constants as a linked list (because there's a
  few of them)
- apply immediate constants after global constants in the constant
  loading function
- both types of constants now get loaded with array notation in the
  shader (into the same array)
6 files changed