A missing 'else' in chunk_alloc_mmap() caused an extra chunk to be
allocated every time the optimistic alignment path was entered, since
the following block would always be executed immediately afterward.
This chunk leak caused no increase in physical memory usage, but virtual
memory could grow until resource exaustion caused allocation failures.
Replace chunk stats code that was missing locking; this fixes a race
condition that could corrupt chunk statistics.
Converting malloc_stats_print() to use mallctl*().
Add a missing semicolon in th DSS code.
Convert malloc_tcache_flush() to a mallctl.
Convert malloc_swap_enable() to a set of mallctl's.
Use optional zeroing in arena_chunk_alloc() to avoid needless zeroing of
chunks. This is particularly important in the context of swapfile and
DSS allocation, since a long-lived application may commonly recycle
chunks.
Clean up whitespace.
Lock access of swap_avail when printing stats.
Use inttypes.h for portable printf() format specifiers, specifically for
uint64_t (PRIu64).
Change highchunks and curchunks stats from (unsigned long) to (size_t).
Fix a stats bug in large object curruns accounting.
Replace tcache_bin_fill() with arena_tcache_fill(), and fix a bug in an OOM
error path.
Fix API name mangling to coexist with __attribute__((malloc)).
