[RISCV][P-ext] Recognize (select (X >u ((1 << C) - 1), sext(X >s -1), trunc(X)) as usati (#190810) Where the result is a type with C bits. The unsigned compare on the select treats negative values as large positive values so any value that isn't in the range [0, (1 << C) - 1] will use the True operand of the select. The sext(X >s -1) creates all ones for positive values of X and 0 for negative values of X. This pattern appears in the picojpeg workload of embench-iot with an i8 result type. Assisted-by: Claude Sonnet 4.5
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