[clang] [llvm] [Clang] Fix cleanup attribute by delaying type checks after the type is deduced (PR #164440)

[Aaron Ballman via llvm-commits]

https://github.com/AaronBallman approved this pull request.

Aside from a few nits, I'm happy if @erichkeane is happy

https://github.com/llvm/llvm-project/pull/164440