[InstCombine] Add additional test coverage for D123374
More basic test coverage for the fold: (A & 2^C1) + A => A & (2^C1 - 1) iff bit C1 in A is a sign bit
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More basic test coverage for the fold: (A & 2^C1) + A => A & (2^C1 - 1) iff bit C1 in A is a sign bit