[RISCV] Fix a bug in partial.reduce lowering for zvqdotq .vx forms (#142185) I'd missed a bitcast in the lowering. Unfortunately, that bitcast happens to be semantically required here as the partial_reduce_* source expects an i8 element type, but the pseudos and patterns expect an i32 element type. This appears to only influence the .vx matching from the cases I've found so far, and LV does not yet generate anything which will exercise this. The reduce path (instead of the partial.reduce one) used by SLP currently manually constructs the i32 value, and then goes directly to the pseudo's with their i32 arguments, not the partial_reduce nodes. We're basically loosing the .vx matching on this path until we teach splat matching to be able to manually splat the i8 value into an i32 via LUI/ADDI.
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