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[x86] use SETCC_CARRY instead of SBB node for select lowering
This is a suggested follow-up to D116765. This removes a clear of the register operand, so it is better for code size, but it does potentially create a false register dependency on surrounding code. If that is a problem, it should be solvable using dependency-breaking code that is used for other instructions. Differential Revision: https://reviews.llvm.org/D116804
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