[LegalizeTypes][RISCV][LoongArch] Optimize promotion of ucmp. (#101366) ucmp can be promoted with either sext or zext. RISC-V and LoongArch prefer sext for promoting i32 to i64 unless the inputs are known to be zero extended already. This patch uses the existing SExtOrZExtPromotedOperands function that is used by SETCC promotion to intelligently handle this.
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