ia32: Simplify ia32_set_frame_offset() PopMem adjustments

No need to adjust Pop which cannot have frame offset destinations,
determine whether the fixup is necessary by checking the base register
used instead of relying on generic frame offset stuff.

ir/be/ia32/bearch_ia32.c

@@ -150,23 +150,21 @@ static void ia32_set_frame_entity(ir_node *node, ir_entity *entity,
 	set_ia32_ls_mode(node, mode);
 }
 
-static void ia32_set_frame_offset(ir_node *irn, int bias)
+static void ia32_set_frame_offset(ir_node *node, int bias)
 {
-	if (get_ia32_frame_ent(irn) == NULL)
+	if (get_ia32_frame_ent(node) == NULL)
 		return;
 
-	if (is_ia32_Pop(irn) || is_ia32_PopMem(irn)) {
-		ir_graph          *irg     = get_irn_irg(irn);
-		be_stack_layout_t *layout  = be_get_irg_stack_layout(irg);
-		if (layout->sp_relative) {
-			/* Pop nodes modify the stack pointer before calculating the
-			 * destination address, so fix this here
-			 */
-			ir_mode *mode = get_ia32_ls_mode(irn);
+	/* Pop nodes modify the stack pointer before calculating the
+	 * destination address, fix this here */
+	if (is_ia32_PopMem(node)) {
+		ir_node *base = get_irn_n(node, n_ia32_PopMem_base);
+		if (arch_get_irn_register(base) == &ia32_registers[REG_ESP]) {
+			ir_mode *mode = get_ia32_ls_mode(node);
 			bias -= get_mode_size_bytes(mode);
 		}
 	}
-	add_ia32_am_offs_int(irn, bias);
+	add_ia32_am_offs_int(node, bias);
 }
 
 int ia32_get_sp_bias(const ir_node *node)