Don't invalidate one byte beyond the end

src/librustc_mir/interpret/memory.rs

@@ -844,7 +844,7 @@ fn clear_relocations(&mut self, ptr: Pointer, size: Size) -> EvalResult<'tcx> {
         }
 
         // Forget all the relocations.
-        alloc.relocations.remove_range(first ..= last);
+        alloc.relocations.remove_range(first .. last);
 
         Ok(())
     }