Update src/alloc/isolated_alloc.rs

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

Author: nia-e

src/alloc/isolated_alloc.rs

@@ -44,8 +44,8 @@ impl IsolatedAlloc {
     fn add_page(&mut self, page_size: usize) -> (*mut u8, &mut DenseBitSet<usize>) {
         let page_layout = unsafe { Layout::from_size_align_unchecked(page_size, page_size) };
         let page_ptr = unsafe { alloc::alloc(page_layout) };
-        // `page_infos` has to have one-eighth as many bits as a page has bytes
-        // (or one-64th as many bytes)
+        // `page_infos` has to have one bit for each `COMPRESSION_FACTOR`-sized chunk of bytes in the page.
+        assert!(page_size % COMPRESSION_FACTOR == 0);
         self.page_infos.push(DenseBitSet::new_empty(page_size / COMPRESSION_FACTOR));
         self.page_ptrs.push(page_ptr);
         (page_ptr, self.page_infos.last_mut().unwrap())