[llvm] [RISCV][CostModel] Estimate cost of Extract/InsertElement with non-constant index when vector instructions are not available (PR #67334)

[Philip Reames via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 3
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preames wrote:

Can you precommit the tests so that we can see the diff?  You don't need separate review for that.  

https://github.com/llvm/llvm-project/pull/67334