[RISCV] Run VLOptimizer right after ISel (#179377) When working on #177238 I found some cases where machine SSA optimizations (or any optimizations that run before the current VLOptimizer, really) can benefit from reduced VL operands. In addition, by running VLOptimizer early, in the future we can further remove the mini VL reduction currently in RISCVVectorPeephole, once we teach VLOptimizer some corner cases (e.g. handle vector stores). This patch therefore moves VLOptimizer to be (basically) right after the ISel phase.
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