ir_to_mesa: Generate gl_program_parameter list by walking the GLSL IR.

ir_to_mesa: Generate gl_program_parameter list by walking the GLSL IR.

Generate the program parameters list by walking the IR instead of by
walking the list of linked uniforms.  This simplifies the code quite a
bit, and is probably a bit more correct.  The list of linked uniforms
should really only be used by the GL API to interact with the
application.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Cc: Bryan Cain <bryancain3@gmail.com>
Cc: Eric Anholt <eric@anholt.net>