[PATCH] [Mips][Disassembler][R6] Disassembler crashes on compact jump instructions for r6

[Vladimir Medic]

Hi dsanders, sstankovic,

When disassembler meets compact jump instructions for r6 it crashes as the access to operands array is out of range. This patch adds dedicated decoder method that properly handles decoding of these instructions.

http://reviews.llvm.org/D6817

Files:
  lib/Target/Mips/Disassembler/MipsDisassembler.cpp
  lib/Target/Mips/Mips32r6InstrInfo.td
  test/MC/Disassembler/Mips/mips32r6/valid-mips32r6-el.txt
  test/MC/Disassembler/Mips/mips32r6/valid-mips32r6.txt
  test/MC/Disassembler/Mips/mips32r6/valid-xfail-mips32r6.txt
  test/MC/Disassembler/Mips/mips64r6/valid-mips64r6-el.txt
  test/MC/Disassembler/Mips/mips64r6/valid-mips64r6.txt
  test/MC/Disassembler/Mips/mips64r6/valid-xfail-mips64r6.txt

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