[PATCH][AArch64] Handle aliases of conditional branches without b.pred form.

[Chad Rosier]

Hi,
This patch teaches the AArch64 backend to accept aliases for conditional
branches that don't follow the br.pred form.  I don't believe these
aliases are specified in the documentation, but they do appear to be
accepted by gcc.  I would have preferred to do this as a MnemonicAlias,
but renaming has to be done at parse-time, as opposed to instruction
matching time, as it effects the MI operands.

 Chad
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