[PATCH] ARM: fix pc-relative thumb loads decoding (literal loads)

[Amaury de la Vieuville]

This fixes two previous issues:
  * Negative offsets are now correctly disassembled
  * The decoded opcode was not the right one


http://llvm-reviews.chandlerc.com/D973

Files:
  lib/Target/ARM/ARMInstrThumb2.td
  lib/Target/ARM/Disassembler/ARMDisassembler.cpp
  test/MC/Disassembler/ARM/thumb2.txt
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