A small series with:

- The addition of qht_iter_remove, necessary to safely remove
  a set of elements. This currently has no users, but it's
  easy to implement and very useful to have. (I initially wrote
  it for the sync-profiler, but for unrelated reasons I ended up
  changing the profiler's design not to remove elements.)

- A 3.75X speedup for test-qht

- Improvements to qht.c's code coverage with test-qht

You can fetch this series from:
  https://github.com/cota/qemu/tree/qht-for-3.1

Thanks,

		Emilio