[PATCH] [ARM] Fixup sign extend instruction availability w.r.t. DSP extension

[Bradley Smith]

The thumb2 instructions sxtab/sxtah/sxtab16/sxtb16 and their unsigned counterparts are only available when the DSP extension is available, currently not all of these instructions and their aliases respect this. This patch fixes this up to be consistent.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7057

Files:
  lib/Target/ARM/ARMInstrThumb2.td
  test/MC/ARM/thumb2-dsp-diag.s

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