[llvm] [SLP] Precommit test demonstrating `catchswitch` crash. (PR #136084)

[Alexey Bataev via llvm-commits]

alexey-bataev wrote:

Thanks for the test, I used it for the fix in 5fe91f1b5948591b75416ce529b3179234c8d93d

https://github.com/llvm/llvm-project/pull/136084