[llvm] [RISCV][GISEL] instruction-select for G_SPLAT_VECTOR (PR #111193)

[Michael Maitland via llvm-commits]

michaelmaitland wrote:

I don't plan to continue working on this, and it sounds like preferred approach is to add patterns for G_SPLAT_VECTOR, which is different than the approach taken here. As a result, I am going to close this PR.

https://github.com/llvm/llvm-project/pull/111193