[llvm] [CodeGen][CodeLayout] Fix segfault on access to deleted block in MBP. (PR #142357)

[Afanasyev Ivan via llvm-commits]

ivafanas wrote:

> Did you try llvm-reduce on it?

Yes. No effect.

I've spent ~1 day in different attempts to reduce the test case =)

https://github.com/llvm/llvm-project/pull/142357