[PATCH] ARM: Mark double-precision instructions as such

[Tim Northover]

Cortex-M4F doesn't support double precision VFP operations.

We already have a subtarget feature for this which helps with CodeGen, but the instructions themselves weren't marked appropriately so we silently assembled invalid instructions.

Hopefully this catches all of them, but I'd appreciate someone giving it a quick check. And any other comments, of course.

Cheers.

Tim.

http://llvm-reviews.chandlerc.com/D2015

Files:
  lib/Target/ARM/ARMInstrFormats.td
  lib/Target/ARM/ARMInstrInfo.td
  lib/Target/ARM/ARMInstrVFP.td
  test/MC/ARM/single-precision-fp.s
  test/MC/ARM/vfp4.s
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