[PATCH] [ARM] Add v8.1a "Privileged Access Never" extension

[Vladimir Sukharev]

REPOSITORY
  rL LLVM

================
Comment at: test/MC/Disassembler/ARM/armv8.1a.txt:41
@@ +40,3 @@
+# the disassembler is correctly disambiguating and decoding these instructions.
+
+[0x00 0x00 0x10 0xf1]
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Namely, this comment explains why "DecodeTSTInstruction" is needed

http://reviews.llvm.org/D8504

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