Noah Goldstein 15a7de697a [SelectionDAG] Support sign tracking through {S|U}INT_TO_FP
Just a minimal amount of easily provable tracking.

Proofs: https://alive2.llvm.org/ce/z/RQYbdw

Closes #82808

Alive2 to has an issue with `(sitofp i1)`, but it can
be verified by hand: https://godbolt.org/z/qKr7hT7s9
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