[InstCombine] add folds for xor-of-icmp signbit tests (PR36682)
This is part of solving: https://bugs.llvm.org/show_bug.cgi?id=36682 There's also a leftover improvement from the long-ago-closed: https://bugs.llvm.org/show_bug.cgi?id=5438 https://rise4fun.com/Alive/dC1 llvm-svn: 328119
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