[llvm] Analysis: Remove no-AssumptionCache path in getKnowledgeForValue (PR #139232)

[Matt Arsenault via llvm-commits]

arsenm wrote:

### Merge activity

* **May 9, 6:22 AM EDT**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/139232).


https://github.com/llvm/llvm-project/pull/139232