[llvm] [NVPTX] Pull invariant load identification into IR pass (PR #138015)

[Alex MacLean via llvm-commits]

AlexMaclean wrote:

@fmayer sorry about that! I'm very unfamiliar with the GN build. I suppose that this file may need to be updated to add the new source file? It looks like a bot normally does this automatically? https://github.com/llvm/llvm-project/blob/b2e2ae8702e9fbbe0ef0eb5929aa2d5dc867b1c5/llvm/utils/gn/secondary/llvm/lib/Target/NVPTX/BUILD.gn#L30-L34 

https://github.com/llvm/llvm-project/pull/138015