Tests: do not hard-code 64 bits/8 bytes as pointer width

This wouldn't be true for all platforms.

Author: tautschnig

regression/cbmc/assigning_nullpointers_should_not_crash_symex/main.c

@@ -6,9 +6,19 @@ struct linked_list
   struct linked_list *next;
 };
 
+#ifdef _WIN32
+#  ifdef _M_X64
+#    define POINTER_BYTES 8ul
+#  else
+#    define POINTER_BYTES 4ul
+#  endif
+#else
+#  define POINTER_BYTES __SIZEOF_POINTER__
+#endif
+
 int main(void)
 {
-  size_t list_sz = 8ul;
+  size_t list_sz = POINTER_BYTES;
   assert(list_sz == sizeof(struct linked_list));
   struct linked_list *list = malloc(list_sz);
   // this line makes symex crash for some reason

regression/cbmc/simplify_singleton_interval_7690/singleton_interval_in_assume_7690.c

@@ -6,10 +6,16 @@
 #include <stdint.h>
 
 extern size_t __CPROVER_max_malloc_size;
-int __builtin_clzll(unsigned long long);
 
+#if defined(_WIN32) && defined(_M_X64)
+int __builtin_clzll(unsigned long long);
 #define __nof_symex_objects                                                    \
   ((size_t)(1ULL << __builtin_clzll(__CPROVER_max_malloc_size)))
+#else
+int __builtin_clzl(unsigned long);
+#define __nof_symex_objects                                                    \
+  ((size_t)(1UL << __builtin_clzl(__CPROVER_max_malloc_size)))
+#endif
 
 typedef struct {
   size_t k;