[llvm] [InterleavedAccessPass]: Ensure that dead nodes get erased only once (PR #122643)

[David Green via llvm-commits]

davemgreen wrote:

Could it use SmallSetVector to store the Dead instructions? It should rule out any duplicated whilst keeping them in order, so that they are removed in the correct order.

https://github.com/llvm/llvm-project/pull/122643