[PATCH] [ARM] Fix BXJ is undefined in AArch32.

[Oliver Stannard]

Up to v7[AR], BXJ is unpredictable for r13 and r15, but v8A makes it well-defined for r13. This should be accepted for v8A thumb:

  $ llvm-mc -triple thumbv8a--none-eabi -assemble <<< "bxj r13"
          .text
  <stdin>:1:1: error: instruction requires: arm-mode
  bxj r13
  ^


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http://reviews.llvm.org/D6842

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