[NFC][OpenMP] Update a test that was failing on aarch64.

The failure was reported here:

llvm#164039 (comment)

The test is checking for the "bad" behavior so as to keep track of it.
It could just be updated to check the "good" behavior and marked as
XFAIL, but then it would not be as informative.

The update for now is to fix the pointer arithmetic. If that isn't
sufficient, we can fall back to doing the above.

Author: abhinavgaba

offload/test/mapping/use_device_addr/target_data_use_device_addr_class_member_ref_with_map.cpp

@@ -16,7 +16,7 @@ struct ST {
   int m = 0;
 
   void f6() {
-    uintptr_t offset = (uintptr_t)&d - n;
+    intptr_t offset = (uintptr_t)&d - n;
 #pragma omp target data map(to : m, d)
     {
       void *mapped_ptr = omp_get_mapped_ptr(&d, omp_get_default_device());
@@ -34,10 +34,11 @@ struct ST {
         // ref/attach modifiers:
         //  &ref_ptee(this[0].[d])), &ref_ptee(this[0].d), TO | FROM
         //  &ref_ptr(this[0].d), &ref_ptee(this[0].d), 4, ATTACH
-        // EXPECTED: 1 0
-        // CHECK:    0 1
-        printf("%d %d\n", &d == mapped_ptr,
-               (uintptr_t)&d == (uintptr_t)mapped_ptr - offset);
+        // EXPECTED:   1 0
+        // CHECK-NEXT: 0 1
+        intptr_t offset_device = (intptr_t)mapped_ptr - (intptr_t)&d;
+        printf("%d %d\n", &d == mapped_ptr, offset == offset_device);
+        printf("%lu %ld\n", offset, offset_device);
       }
     }
   }