Memory Leak in Thread Cleanup (jemalloc 4.0.4)

[Christopher Ferris]

It appears, that under certain circumstances, the arenas_cache can be
leaked when shutting down a thread.

Specifically, in tsd.c (function tsd_cleanup), this code:

#define O(n, t)                                                         \
                n##_cleanup(tsd);
MALLOC_TSD
#undef O
                tsd->state = tsd_state_purgatory;
                tsd_set(tsd);
                break;


The cleanup part can wind up creating an arenas_cache, then the tsd_set
clears the arenas_cache pointer, and the memory is leaked away.

I added this call:

                arenas_cache_cleanup(tsd_get());

After the undef and before the tsd->state, and the leak disappears. I'm not
sure if there is a better way to fix this though.

Thanks,

Christopher
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