Use rtree-based chunk lookups rather than pointer bit twiddling.

Look up chunk metadata via the radix tree, rather than using
CHUNK_ADDR2BASE().

Propagate pointer's containing extent.

Minimize extent lookups by doing a single lookup (e.g. in free()) and
propagating the pointer's extent into nearly all the functions that may
need it.

include/jemalloc/internal/chunk.h

@@ -54,6 +54,8 @@ chunk_hooks_t	chunk_hooks_set(tsdn_t *tsdn, arena_t *arena,
 
 bool	chunk_register(tsdn_t *tsdn, const void *chunk, const extent_t *extent);
 void	chunk_deregister(const void *chunk, const extent_t *extent);
+void	chunk_reregister(tsdn_t *tsdn, const void *chunk,
+    const extent_t *extent);
 void	*chunk_alloc_base(size_t size);
 void	*chunk_alloc_cache(tsdn_t *tsdn, arena_t *arena,
     chunk_hooks_t *chunk_hooks, void *new_addr, size_t size, size_t alignment,