[patch] Pass an ArrayRef to MCDisassembler::getInstruction

[Rafael Espíndola]

The attached patches change  MCDisassembler::getInstruction to take an
ArrayRef<uint8_t> instead of a MemoryObject.

Even on X86 there is a maximum size an instruction can have. Given
that, it seems way simpler and more efficient to just pass an ArrayRef
to the disassembler instead of a MemoryObject and have it do a virtual
call every time it wants some extra bytes.

Cheers,
Rafael
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