[clang] [Clang] Fix Sema::checkArgCount for 0-arg functions (PR #139638)

[Derek Schuff via cfe-commits]

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

LGTM from the wasm side. As @hoodmane noted, the underlying wasm instruction has no arguments.

https://github.com/llvm/llvm-project/pull/139638