Update src/intptrcast.rs

Co-authored-by: Ralf Jung <post@ralfj.de>

Author: carbotaniuman

src/intptrcast.rs

@@ -48,6 +48,7 @@ impl<'mir, 'tcx> GlobalStateInner {
     // or `None` if the addr is out of bounds
     fn alloc_id_from_addr(ecx: &MiriEvalContext<'mir, 'tcx>, addr: u64) -> Option<AllocId> {
         let global_state = ecx.machine.intptrcast.borrow();
+        assert!(global_state.provenance_mode != ProvenanceMode::Strict);
 
         let pos = global_state.int_to_ptr_map.binary_search_by_key(&addr, |(addr, _)| *addr);