[llvm] [SLSR] Defer removal of poison-generating annotations if not executed (PR #217093)

[Sjoerd Meijer via llvm-commits]

sjoerdmeijer wrote:

Looks reasonable to me too.

Let's give @fiigii or @dakersnar a chance to comment before merging this. 

https://github.com/llvm/llvm-project/pull/217093