[clang] [llvm] [Clang] Fix argument extensions in CGBlocks.cpp (PR #111740)

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

I looked to see how hard it would be to lower the clang type... seems like it's not hard.  Pushed #113506.  Let me know what you think.

If there's some complication I'm not seeing, I think your suggested API in the current version of this patch makes sense... but using clang types seems much easier on the caller side.

https://github.com/llvm/llvm-project/pull/111740