So, replace the code which counts the nr of bits in the level0
bitmap by just returning the nr of elements in use.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@12272
which is also indexed by UWord. This can be used as a replacement for
WordFM with unboxed keys, when the key ranges are dense. It is
implemented as a 256-way radix tree (4-deep on 32-bit platforms,
8-deep on 64-bit platforms).
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@8806
