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[RISCV] Move RISCVInsertVSETVLI to after phi elimination (#91440)
Split off from #70549, this patch moves RISCVInsertVSETVLI to after phi elimination where we exit SSA and need to move to LiveVariables. The motivation for splitting this off is to avoid the large scheduling diffs from moving completely to after regalloc, and instead focus on converting the pass to work on LiveIntervals. The two main changes required are updating VSETVLIInfo to store VNInfos instead of MachineInstrs, which allows us to still check for PHI defs in needVSETVLIPHI, and fixing up the live intervals of any AVL operands after inserting new instructions. On O3 the pass is inserted after the register coalescer, otherwise we end up with a bunch of COPYs around eliminated PHIs that trip up needVSETVLIPHI. Co-authored-by: Piyou Chen <piyou.chen@sifive.com>
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