[RISCV] Use LiveIntervals::extendToIndices to extend AVL in insertVSETVLI (#97512) In #96200 we handled extending AVL LiveIntervals across basic blocks, which fixed a crash in a test case in 133ab9a8c82a31549f060da33fd7e14f1d7f39fd. This was done by manually adding a single segment to the LiveInterval to extend it from AVL def -> inserted vsetvli, but in hindsight this was too simple and fails to handle cases where the vsetlvi is located before the AVL def. This patch fixes this by using LiveIntervals::extendToIndices instead which can handle these cases. (The crash that this fixes is separate from the crash in #97264)
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