i965: Remove stale comment.

We stopped doing variable index lowering for uniforms in
a64c1eb9b1, 5 months after the comment was
added.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/dri/i965/brw_shader.cpp

@@ -184,7 +184,6 @@ brw_link_shader(struct gl_context *ctx, struct gl_shader_program *shProg)
                     "back to very inefficient code generation\n");
       }
 
-      /* FINISHME: Do this before the variable index lowering. */
       lower_ubo_reference(&shader->base, shader->base.ir);
 
       do {