MFC r347693:
rtld_malloc.c: cleanup morepages().

MFC r347692:
Remove more dead definitions from rtld_malloc.c after r347019.

MFC r347019:
Cleanup for rtld_malloc.c.

PR: 237577

MFC r339877-r339879,r343564-r343566,r343580,r343754:
Untangle jemalloc and mutexes initialization.

The merge includes required warnings cleanup by arichardson, both to
avoid conflicts and to make rt

MFC r339877-r339879,r343564-r343566,r343580,r343754:
Untangle jemalloc and mutexes initialization.

The merge includes required warnings cleanup by arichardson, both to
avoid conflicts and to make rtld_malloc.c compilable with the libthr
WARNS settings.

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