[VectorCombine] Fold vector.interleave2 with two constant splats#125144

mshockwave merged 5 commits intollvm:mainllvm/llvm-project:mainfrom

mshockwave:patch/veccombine-interleave-splatmshockwave/llvm-project:patch/veccombine-interleave-splatCopy head branch name to clipboard