[llvm] [RISCV][RFC] Deduplicate LLVM IR in fixed vector tests. NFC (PR #111395)

[Ramkumar Ramachandra via llvm-commits]

https://github.com/artagnon commented:

Actually a decent idea related to this came up recently: https://discourse.llvm.org/t/add-matrix-style-preprocessing-to-lit-to-reuse-tests-across-backends/87824. I'm not sure who would be motivated to work on it though.

https://github.com/llvm/llvm-project/pull/111395