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Use force_sig_fault to implement unknown opcode. This just uninlines that function, so simplify things by using it. Fold in EXCP_NOCP and EXCP_INVSTATE, as is done in linux-user. Make a note about slight differences with FreeBSD in case any of them turn out to be important later. Signed-off-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>