Clang accepts indirectly invoking a consteval function outside of a manifestly constant evaluated context

https://godbolt.org/z/7rG65c13e

The following code is accepted by clang 22.1.0:

```cpp
consteval void f(int) {}

int main() {
auto g = []() consteval {
return [](int x) {
f(x);
};
}();

int x = 42;
g(x);
}
```

A PLT call to the wrapped consteval function (`f`) is emitted which invokes a linker error.

Start by reproducing the Godbolt example with Clang 22.1.0, focusing on the consteval lambda and its indirect call to f. Trace how Clang handles this invocation outside a manifestly constant-evaluated context, and verify that the fix prevents the emitted PLT call and resulting linker error.

Written by the indexing model from the issue text.