DTrace: re-merge remainder of r249367 (original from Illumos).
Bring back some important fixes from Illumos:
3022 DTrace: keys should not affect the sort order when sorting by value 3023 it should be possible to dereference dynamic variables 3024 D integer narrowing needs some work
We particularly avoid the LD_NOLAZYLOAD changes that Illumos made as those don't apply to FreeBSD and were causing problems in interactive mode.
Illumos Revision: 13758:23432da34147
Reference:
https://www.illumos.org/issues/3022 https://www.illumos.org/issues/3023 https://www.illumos.org/issues/3024
MFC after: 1 month Tested by: markj
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