[clang] [Clang] SemaFunctionEffects: Fix bug where lambdas produced by template expansion weren't verified. (PR #116505)

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Sirraide wrote:

> Something like:

The function template is pretty much what I meant, yeah, but by ‘templated lambda’ I meant either one that is an implicit template because one of its parameters is declared with `auto` (`[](auto x)`) or one that has an explicit template parameter list (`[]<typename T>`).

https://github.com/llvm/llvm-project/pull/116505