Comment 11 for bug 1663287

If my memory is correct, this problem doesn't need qemu to execute the code, it only needs it to translate the code. In the original test case the invalid instructions were actually dead code but still managed to crash qemu.

I suggest following Yongbok Kim's approach and signalling Reserved Instruction in the same way R6 does. I think that's architecturally allowed, although I admit that it's ages since I looked at this.