[llvm] [RISCV][TTI] Model partial reduce of ext for zvqdotq (PR #146788)

[David Sherwood via llvm-commits]

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david-arm wrote:

Sure that's fine. I won't block the PR for that. I was just thinking that it might be useful to add something in a different, small test file. Anyway, that can always be done in a separate PR if you think it's useful.

https://github.com/llvm/llvm-project/pull/146788