[RISCV][VLOPT] Fix assertion failure across blocks (#124734) Whilst adding a cross-block test, I encountered an assertion failure in the second pass where we check the instruction popped off the worklist is a candidate. The leaf instruction %c in this case will be added to the worklist when its VL is VLMAX, but during the first pass it will have its VL reduced to 1. Then in the second pass when its processed via the worklist, isCandidate will no longer be true due to its VL == 1. This fixes it by moving the VL == 1 check to tryReduceVL, keeping it alongside the other VL check for bailing out early as an optimisation.
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