[PATCH] [Thumb2] LDRS?[BH] cannot load to the PC

[Oliver Stannard]

The Thumb2 LDRS?[BH] instructions are not valid when the destination
register is the PC (these encodings are used for preload hints).

http://reviews.llvm.org/D5868

Files:
  lib/Target/ARM/ARMInstrThumb2.td
  test/MC/ARM/thumb2-ldrb-ldrh.s
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