[PATCH] Add assertion to detect invalid registers in the PowerPC MC instruction lowering

[hfinkel at anl.gov]

Thanks for looking into this. I'd prefer to use the enum fields directly, however, instead of calling getRegisterName. We should just be able to write this:

  assert(MO.getReg() > PPC::NoRegister && MO.getReg() < PPC::NUM_TARGET_REGS &&
              "Invalid register for this target!");


http://reviews.llvm.org/D8384

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