[PATCH] ARM: Tighten up disassembling of MSR mask for M-class

[Petr Pavlu]

Allow only disassembling of M-class MSR masks that the assembler knows how to assemble back.

Note: The current code in DecodeMSRMask() rejects the unpredictable A/R MSR mask '0000' with Fail. The code in the patch follows this style and rejects unpredictable M-class MSR masks also with Fail (instead of SoftFail). If SoftFail is preferred in this case then additional changes to ARMInstPrinter (to print non-symbolic masks) and ARMAsmParser (to parse non-symbolic masks) will be needed.

http://reviews.llvm.org/D4694

Files:
  lib/Target/ARM/Disassembler/ARMDisassembler.cpp
  test/MC/Disassembler/ARM/invalid-thumb-MSR-MClass.txt
  test/MC/Disassembler/ARM/thumb-MSR-MClass.txt
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