Andrew Turner 4ffa494e4f Add more 8 and 16 bit variants of the the atomic(9) functions on arm64.
These are direct copies of the 32 bit functions, adjusted ad needed.
While here fix atomic_fcmpset_16 to use the valid load and store exclusive
instructions.

Sponsored by:	DARPA, AFRL
2019-11-07 17:34:44 +00:00
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