[InstCombine] Pre-commit ashr(or(neg(x),x),bw-1) --> sext(icmp_ne(x,0)) tests from D105764
Added 'thwart complexity-based canonicalization' hacks and the lshr(or(neg(x),x),bw-1) --> zext(icmp_ne(x,0)) variants suggested by Sanjay.
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