[llvm] [JumpThreading][GVN] Copy metadata when inserting preload into preds (PR #134403)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

https://github.com/dtcxzyw/llvm-opt-benchmark/pull/2295 We still need to salvage the UB-implying metadata in GVN (especially for !tbaa).


https://github.com/llvm/llvm-project/pull/134403