[PATCH 3/8][Binutils][AArch64] Refactor err_type.

[Tamar Christina]

Hi All,

Previously the ERR_ values were defined as different constants, to make this a
bit more type safe and so they can be more easily re-used I'm changing them into
an actual enum and updating any usages.

build on native hardware and regtested on
  aarch64-none-elf, aarch64-none-elf (32 bit host),
  aarch64-none-linux-gnu

Cross-compiled and regtested on
  aarch64-none-linux-gnu, aarch64_be-none-linux-gnu

and no issues.

Ok for master?

Thanks,
Tamar

include/
2018-09-24  Tamar Christina  <tamar.christina@arm.com>

	* opcode/aarch64.h (enum err_type): New.
	(aarch64_decode_insn): Use it.

opcodes/
2018-09-24  Tamar Christina  <tamar.christina@arm.com>

	* aarch64-dis.c (ERR_OK, ERR_UND, ERR_UNP, ERR_NYI): Remove.
	(aarch64_decode_insn, print_insn_aarch64_word): Use err_type.

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