[llvm] [InstCombine][RISCV] Convert VPIntrinsics with splat operands to splats (PR #65706)

[Michael Maitland via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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michaelmaitland wrote:

Ok. I've moved it into InstCombine tests. It no longer needs to be RISCV specific and I reflected that by not placing it in InstCombine/RISCV tests.

https://github.com/llvm/llvm-project/pull/65706