Younan Zhang 8549b324bc [Clang] Don't assert non-empty packs for FunctionParmPackExprs (#107561) ...

`FunctionParmPackExpr`s are peculiar in that they have to be of
unexpanded dependency while they don't introduce any unexpanded packs.
So this patch rules them out in the non-empty pack assertion in
`DiagnoseUnexpandedParameterPack()`.

There was a fix #69224, but that turned out to be insufficient.

I also moved the separate tests to a pre-existing file.

Fixes https://github.com/llvm/llvm-project/issues/86361

2024-09-09 15:09:43 +08:00

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