[PATCH][AArch64][binutils] Fix SBO bit in disassembly mask for ldrah.

[Tamar Christina]

Hi All,

The disassembly mask for ldarh incorrectly didn't mask out bit 20 which
is part of the SBO part of the instruction and shouldn't be considered input.

This fixes the wrong bit fixing the disassembly of instructions to
ldarh and makes the behavior consistent.

Build on native hardware and regtested on
  aarch64-none-elf, aarch64-none-elf (32 bit host),
  aarch64-none-linux-gnu, aarch64_be-none-linux-gnu

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

and no issues.

Ok for master? and for backport to binutils-2.31?

Thanks,
Tamar

opcodes/
2018-06-29  Tamar Christina  <tamar.christina@arm.com>

	PR binutils/23242
	* aarch64-tbl.h (ldarh): Fix disassembly mask.

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