[SLP] Skip no-return blocks in spill cost analysis Treat basic blocks containing a non-terminator no-return call as dead-end paths in getSpillCost. Execution doesn't exit such blocks, so their non-vec calls don't keep loop-invariant vector values live. Terminator no-return calls (invoke/callbr) are excluded because their unwind/indirect successors remain reachable. Reviewers: bababuck, hiraditya, RKSimon Pull Request: https://github.com/llvm/llvm-project/pull/197279
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