problem with the arenas_tsd key

[Rich Prohaska]

The value associated with arenas_tsd is set before the key is created.  This
can corrupt some other library that is using key 0.  Attached is a program
that demonstrates the problem and a proposed fix to the problem.  We are not
experts on jemalloc internals, and we would appreciate any feedback about
the fix.

Run "make check_arena_key" to reproduce the crash.

See jemalloc.c for the fix.
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