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3092f40e9f
Heavily simplify logical immediate encoding. This is based on the observation that if a valid repeating element exists, it repeats through `value`. Thus it does not matter which one you analyse. Thus we skip over the least significent element if LSB = 1 by masking it out with `inverse_mask_from_trailing_ones`, to avoid the degenerate case of a stretch of 1 bits going 'round the end' of the word.