[clang] [clang] Allow delayed function instantiation at TU end if initial instantiation fails (PR #117167)

[via cfe-commits]

cor3ntin wrote:

Wait @erichkeane, I think this is just another case of "lambda call operators get instantiated too soon"...
The change is almost certainly not the right solution, but the right solution is... a lot of work...

https://github.com/llvm/llvm-project/pull/117167