Add 00-sanity/39-assert-ptr test

Based on 00-sanity/01-assert.
Related to #1682 (comment).

Author: sim642

tests/regression/00-sanity/39-assert-ptr.c

@@ -0,0 +1,15 @@
+#include <stdlib.h>
+#include <assert.h>
+
+int main() {
+  int* success = malloc(sizeof(int));
+  int* silence = malloc(sizeof(int));
+  int* fail = NULL;
+  int* unknown;
+  // intentionally using assert, specific order to work with assert refine
+  assert(success);
+  assert(unknown); // UNKNOWN!
+  assert(fail); // FAIL!
+  return 0;
+  assert(silence); // NOWARN!
+}