[JumpThreading] Copy metadata when inserting preload into preds#134403

dtcxzyw wants to merge 6 commits intollvm:mainllvm/llvm-project:mainfrom

dtcxzyw:perf/jump-threading-copy-load-metadata-newdtcxzyw/llvm-project:perf/jump-threading-copy-load-metadata-newCopy head branch name to clipboard