all: final cleanups in preparation for release

src/util/xspan_impl_common.h

@@ -114,7 +114,7 @@ forceinline ~CSelf() noexcept {}
     noinline void invalidate() {
         assertInvariants();
         // poison the pointer: point to non-null invalid address
-        ptr = (pointer) (void *) (upx_uintptr_t) 16; // NOLINT(performance-no-int-to-ptr)
+        ptr = (pointer) XSPAN_GET_POISON_VOID_PTR();
         // ptr = (pointer) (void *) &ptr; // point to self
         base = ptr;
         size_in_bytes = 0;