[llvm] [LLVM] Fix assertion when dropping type tests with SelectInst users (PR #185523)

[Paul Kirth via llvm-commits]

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@@ -0,0 +1,19 @@
+; Test to ensure dropping of type tests can handle a select feeding the assume.
+; This pattern is created by SimplifyCFG when merging two type test + assume
+; sequences from different branches.
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ilovepi wrote:

```suggestion
;; Test to ensure dropping of type tests can handle a select feeding the assume.
;; This pattern is created by SimplifyCFG when merging two type test + assume
;; sequences from different branches.
```
nit: we normally have an extra comment marker in test files to make it clear its not part of a RUN line. That or we use the comment label `; COM: whatever comment...`

https://github.com/llvm/llvm-project/pull/185523