target-arm: Handle UNDEF cases for Neon invalid modified-immediates
For Neon "one register and a modified immediate value" forms, the combination op=1 cmode=1111 is unallocated and should UNDEF. All instructions of this form also UNDEF if Q == 1 and Vd<0> == 1. We also add a comment on the only UNPREDICTABLE in this space. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
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