[Vm-dev] armV8 Alien update

[ken.dickey at whidbey.com]

FFICallbackThunk>>initialize fails for aarch64 with Alien-Core-eem.122
complaining:
   ByteArray(Object)>>doesNotUnderstand: #unsignedLongLongAt:put:

As this method is defined in class Alien, perhaps something like the 
attached? (tested,works)

Cheers,
-KenD
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