nu_bsf was returning a wrong value in the LDC path#27
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Explanation: The 'llvm.cttz' intrinsic counts the trailing (least significant) zeros in a variable. This number of zeroes is already the index of the first least significant set bit. Since nu_bsf(0) is UB, no edge case.
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Explanation: The 'llvm.cttz' intrinsic counts the trailing (least significant) zeros in a variable. This number of zeroes is already the index of the first least significant set bit. Since nu_bsf(0) is UB, no edge case.
This helps getting the intel-intrinsics test suite working on nurt+wasm32