mie: ir: op: keep a pointer to the block that contains the op

mie/include/mie/ir/op.h

@@ -55,6 +55,7 @@ struct mie_op {
 	const struct mie_dialect *op_dialect;
 	const struct mie_op_definition *op_info;
 
+	struct mie_block *op_container;
 	struct mie_file_span op_name_span;
 	/* only valid if the F_RESOLVED flag is NOT set */
 	char *op_name;

mie/ir/block.c

@@ -4,7 +4,15 @@
 
 struct mie_op *mie_block_add_op(struct mie_block *block)
 {
-	return mie_vector_emplace_back(block->b_ops, NULL);
+	struct mie_op *op = mie_vector_emplace_back(block->b_ops, NULL);
+	if (!op) {
+		return NULL;
+	}
+
+	mie_op_init(op);
+	op->op_container = block;
+
+	return op;
 }
 
 struct mie_register *mie_block_add_param(struct mie_block *block)