remove unused tail_call attribute from Call

ir/ir/irdumptxt.c

@@ -203,8 +203,6 @@ void dump_irnode_to_file(FILE *F, ir_node *n)
 	} break;
 	case iro_Call: {
 		ir_type *tp = get_Call_type(n);
-		if (get_Call_tail_call(n))
-			fprintf(F, "  tail call\n");
 		ir_fprintf(F, "  calling method of type %+F\n", tp);
 		if (get_unknown_type() != tp) {
 			size_t i;

ir/ir/iropt.c

@@ -6541,7 +6541,7 @@ static int node_cmp_attr_Call(const ir_node *a, const ir_node *b)
 {
 	const call_attr *pa = &a->attr.call;
 	const call_attr *pb = &b->attr.call;
-	if (pa->type != pb->type || pa->tail_call != pb->tail_call)
+	if (pa->type != pb->type)
 		return 1;
 	return node_cmp_exception(a, b);
 }

ir/ir/irtypes.h

@@ -259,7 +259,6 @@ typedef struct call_attr {
 	except_attr exc;               /**< the exception attribute. MUST be the first one. */
 	ir_type     *type;             /**< type of called procedure */
 	ir_entity   **callee_arr;      /**< result of callee analysis */
-	unsigned    tail_call:1;       /**< if set, can be a tail call */
 } call_attr;
 
 /** Builtin attributes. */

scripts/ir_spec.py

@@ -267,12 +267,6 @@ class Call(Op):
 			name    = "type",
 			comment = "type of the call (usually type of the called procedure)",
 		),
-		dict(
-			type = "unsigned",
-			name = "tail_call",
-			# the tail call attribute can only be set by analysis
-			init = "0",
-		)
 	]
 	attr_struct = "call_attr"
 	pinned      = "memory"