[InstSimplify] Fold `getelementptr inbounds null, idx -> null`#130742

dtcxzyw merged 2 commits intollvm:mainllvm/llvm-project:mainfrom

dtcxzyw:perf/gep-null-inboundsdtcxzyw/llvm-project:perf/gep-null-inboundsCopy head branch name to clipboard