message: re-enable reuse
diff: @@ -101,13 +101,13 @@ public:
  d_assert(sizeClass < NumBins);
  // check our bins for a miniheap to reuse
  - // MiniHeap *existing = _littleheaps[sizeClass].selectForReuse();
  - // if (existing != nullptr) {
  - // existing->reattach(_prng, _fastPrng); // populate freelist, set attached bit
  - // d_assert(existing->isAttached());
  - // // TODO: check that metadata is right?
  - // return existing;
  - // }
  + MiniHeap *existing = _littleheaps[sizeClass].selectForReuse();
  + if (existing != nullptr) {
  + existing->reattach(_prng, _fastPrng); // populate freelist, set attached bit
  + d_assert(existing->isAttached());
  + // TODO: check that metadata is right?
  + return existing;
  + }
  // if we have objects bigger than the size of a page, allocate
  // multiple pages to amortize the cost of creating a
  