kib e854394704 Cleanup for rtld_malloc.c.
- Remove dead and most likely rotten MALLOC_DEBUG, MSTAT, and RCHECK options.
- Remove unused headers.
- Remove one case of undefined behavior where left shift could overflow.
  It is impossible on practice for rtld and libthr consumer.

PR:	237577
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2019-05-02 15:03:16 +00:00
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