[clang] [C++20][Modules] Restore inliness of constexpr/consteval functions defined in-class (PR #109470)

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tomasz-kaminski-sonarsource wrote:

The correct link is https://github.com/llvm/llvm-project/commit/97af17c5. The commit id remains the same.

https://github.com/llvm/llvm-project/pull/109470