[PATCH] Instantiate static constexpr member function of a local struct in a function template earlier.

[Michael Park]

This patch instantiates the pending local instantiations earlier in order
to enable to following code to compile:

  template <typename T>
  void F() {
    struct Num {
      static constexpr int Get() { return 42; }
    };
    constexpr int n = Num::Get();
  }

  int main() {
    F<int>();
  }

This addresses PR20625.
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