disallow Conv Is(xx b)

It was a strange feature only inspired by the lazyness of some frontend
developer (=me)

ir/ir/iropt.c

@@ -6124,28 +6124,6 @@ static ir_node *transform_node_Mux(ir_node *n)
 				}
 			}
 		}
-
-		/* more normalization: Mux(sel, 0, 1) is simply a conv from the mode_b
-		 * value to integer. */
-		if (is_Const(t) && is_Const(f) && mode_is_int(mode)) {
-			ir_tarval *a = get_Const_tarval(t);
-			ir_tarval *b = get_Const_tarval(f);
-
-			if (tarval_is_one(a) && tarval_is_null(b)) {
-				ir_node *block = get_nodes_block(n);
-				ir_node *conv  = new_r_Conv(block, sel, mode);
-				n = conv;
-				DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_CONV);
-				return n;
-			} else if (tarval_is_null(a) && tarval_is_one(b)) {
-				ir_node *block = get_nodes_block(n);
-				ir_node *not_  = new_r_Not(block, sel, mode_b);
-				ir_node *conv  = new_r_Conv(block, not_, mode);
-				n = conv;
-				DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_CONV);
-				return n;
-			}
-		}
 	}
 
 	if (is_Cmp(sel) && mode_is_int(mode) && is_cmp_equality_zero(sel)) {

ir/ir/irverify.c

@@ -1437,7 +1437,7 @@ static int verify_node_Conv(const ir_node *n)
 	ir_mode *mymode  = get_irn_mode(n);
 	ir_mode *op1mode = get_irn_mode(get_Conv_op(n));
 
-	ASSERT_AND_RET_DBG(mode_is_datab(op1mode) && mode_is_data(mymode),
+	ASSERT_AND_RET_DBG(mode_is_data(op1mode) && mode_is_data(mymode),
 		"Conv node", 0,
 		show_unop_failure(n, "/* Conv: BB x datab --> data */");
 	);

ir/lower/lower_mode_b.c

@@ -237,7 +237,7 @@ static bool needs_mode_b_input(const ir_node *node, int input)
 
 /**
  * Collects "roots" of a mode_b calculation. These are nodes which require a
- * mode_b input (Cond, Mux, Conv(xxx_b))
+ * mode_b input (Cond, Mux)
  */
 static void collect_needs_lowering(ir_node *node, void *env)
 {
@@ -245,7 +245,7 @@ static void collect_needs_lowering(ir_node *node, void *env)
 	int i;
 	(void) env;
 
-	/* if the node produces mode_b then it is a not a root (but should be
+	/* if the node produces mode_b then it is not a root (but should be
 	 * something our lower_node function can handle) */
 	if (get_irn_mode(node) == mode_b) {
 		assert(is_And(node) || is_Or(node) || is_Eor(node) || is_Phi(node)