Add testcase for already fixed PR [PR94436]

2020-04-01  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/94436
	* gcc.dg/pr94436.c: New test.

gcc/testsuite/ChangeLog

 2020-04-01  Jakub Jelinek  <jakub@redhat.com>
 
+	PR middle-end/94436
+	* gcc.dg/pr94436.c: New test.
+
 	PR middle-end/94423
 	* gcc.dg/ubsan/pr94423.c: New test.
 

gcc/testsuite/gcc.dg/pr94436.c

+/* PR middle-end/94436 */
+/* { dg-do compile } */
+/* { dg-options "-Wincompatible-pointer-types" } */
+
+struct S { int s; };
+int foo (struct S *);
+
+int
+bar (void)
+{
+  int s = 0;
+  return foo ((struct S *) ((char *) &s - (char *) &((struct S *) 0)->s));	/* { dg-bogus "from incompatible pointer type" } */
+}