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ncg(aarch64): Implement MO_BSwap using REV

Rodrigo Mesquita requested to merge wip/romes/bswap into master 
    ncg(aarch64): Implement MO_BSwap using REV

    Implements MO_BSwap by producing assembly to do the byte swapping
    instead of producing a foreign call a C function.

    In `tar`, the hot loop for `deserialise` got almost 4x faster by
    avoiding the foreign call which caused spilling live variables to the
    stack -- this means the loop did 4x more memory read/writing than
    necessary in that particular case!
  • Implement test-primops for byteswap
Edited by Rodrigo Mesquita

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