[RISCV] Add special case for i32 uaddo X, -1 on RV64.
uaddo X, -1 over flows if X is non-zero. Matches what we do i32 uaddo X, -1 on RV32. Fixes #61891.
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uaddo X, -1 over flows if X is non-zero. Matches what we do i32 uaddo X, -1 on RV32. Fixes #61891.