JIT build fix

Author: nielsdos

ext/opcache/jit/zend_jit.c

@@ -156,6 +156,13 @@ static int zend_jit_assign_to_variable(dasm_State    **Dst,
                                        zend_jit_addr   res_addr,
                                        bool       check_exception);
 
+bool dominates(const zend_basic_block *blocks, int a, int b) {
+	while (blocks[b].level > blocks[a].level) {
+		b = blocks[b].idom;
+	}
+	return a == b;
+}
+
 static bool zend_ssa_is_last_use(const zend_op_array *op_array, const zend_ssa *ssa, int var, int use)
 {
 	int next_use;