i965: move the fetch_constants() call before setting conditional mod state

Before, the instruction's CondUpdate field was mistakenly effecting the
constant-fetch operation.

Fixes progs/glsl/bump.c demo.  But there are some other issues related
to condition flags and IF/ELSE that need investigation...

src/mesa/drivers/dri/i965/brw_wm_glsl.c

@@ -2620,6 +2620,10 @@ static void brw_wm_emit_glsl(struct brw_context *brw, struct brw_wm_compile *c)
     for (i = 0; i < c->nr_fp_insns; i++) {
 	struct prog_instruction *inst = &c->prog_instructions[i];
 
+        /* fetch any constants that this instruction needs */
+        if (c->use_const_buffer)
+           fetch_constants(c, inst);
+
 	if (inst->CondUpdate)
 	    brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ);
 	else
@@ -2630,10 +2634,6 @@ static void brw_wm_emit_glsl(struct brw_context *brw, struct brw_wm_compile *c)
         _mesa_print_instruction(inst);
         */
 
-        /* fetch any constants that this instruction needs */
-        if (c->use_const_buffer)
-           fetch_constants(c, inst);
-
 	switch (inst->Opcode) {
 	    case WM_PIXELXY:
 		emit_pixel_xy(c, inst);