[llvm] [SimplifyCFG] Preserve common TBAA metadata when hoisting instructions. (PR #97158)

[Antonio Frighetto via llvm-commits]

antoniofrighetto wrote:

Just an orthogonal note a latere, I think this LockstepReverseIterator and its companion in GVNSink could be unified (logic seems basically the same, modulo the other uses an extra ActiveBlocks?), or at the least be polished up a bit?

https://github.com/llvm/llvm-project/pull/97158