[clang] [Clang][Sema] Abbreviated function templates do not append invented parameters to empty template parameter lists (PR #80864)

[Nico Weber via cfe-commits]

nico wrote:

This breaks check-clang-tools: http://45.33.8.238/linux/130320/step_8.txt

Please take a look and revert for now if it takes a while to fix.

https://github.com/llvm/llvm-project/pull/80864