[PATCH] [Mips][Disassembler][R6] Disassembler crashes on cache/pref instructions for r6

[Vladimir Medic]

Hi dsanders, sstankovic,

When disassembler meets cache/pref instructions for r6 it crashes as the access to operands array is out of range. This patch adds dedicated decoder method for R6 CACHE_HINT_DESC class that properly handles decoding of these instructions.

http://reviews.llvm.org/D6810

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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