Update tests

Author: lucic71

tests/unit/union_cross_arm_cast.c

@@ -1,4 +1,4 @@
-// no-compile: refcount
+// panic: refcount
 #include <assert.h>
 #include <stddef.h>
 #include <stdint.h>

tests/unit/union_nested.c

@@ -1,4 +1,4 @@
-// no-compile: refcount
+// panic: refcount
 #include <assert.h>
 #include <stdint.h>
 #include <string.h>

tests/unit/union_pointer_pun_address.c

@@ -1,4 +1,4 @@
-// no-compile: refcount
+// panic: refcount
 #include <assert.h>
 
 struct node_a {

tests/unit/union_struct_dual_use.c

@@ -1,4 +1,4 @@
-// no-compile: refcount
+// panic: refcount
 #include <assert.h>
 #include <string.h>