[PATCH] ARM: ISB options other than SY are reserved

[Amaury de la Vieuville]

Hi,

This patch fixes the ISB operand assembly/disassembly which used to
accept the same barrier options as DMB (ST, ISH, ...).
Encodings other than SY are reserved.
It may be a good idea to implement the namedimm/mapper mechanism from
AArch64 to get rid of that kind of code.

Thanks,
Amaury 
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