[InstCombine] add fold for demand of low bit of abs()
This is one problem shown in https://llvm.org/PR49763 https://alive2.llvm.org/ce/z/cV6-4K https://alive2.llvm.org/ce/z/9_3g-L
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This is one problem shown in https://llvm.org/PR49763 https://alive2.llvm.org/ce/z/cV6-4K https://alive2.llvm.org/ce/z/9_3g-L