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Andy McFadden 5b75ae35fc Fix ANDImm flag updater
For nonzero values we were leaving Z=prev, which is wrong when Z=0
because the AND result might be zero.  Now if Z=1 we leave it alone,
but if Z=0 we now set it to Z=?.

Test 1003-flags-and-branches was testing for the (incorrect)
behavior, so we're now running into a BRK.  This is fine.
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