[ExpandIRInsts] Allow int bw == float bw in itofp (#179943) I don't think anything here requires the integer bit width to be strictly larger. It's fine if it's the same (in which case some zexts just go away). Add tests on half + i32 that can be verified by alive2. Note that half is handled via float, so the minimum supported type is i32 rather than i16. Proof (uitofp): https://alive2.llvm.org/ce/z/CsMfkU Proof (sitofp): https://alive2.llvm.org/ce/z/jzuxyt
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