linker: Track uniform locations to new tracking structures

This is just the infrastructure and the code.  It's not used yet.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Tested-by: Tom Stellard <thomas.stellard@amd.com>

src/glsl/linker.h

@@ -34,6 +34,9 @@ extern void
 link_invalidate_variable_locations(gl_shader *sh, enum ir_variable_mode mode,
 				   int generic_base);
 
+extern void
+link_assign_uniform_locations(struct gl_shader_program *prog);
+
 /**
  * Class for processing all of the leaf fields of an uniform
  *