[Clang] FunctionEffects: properly extract the type of a bound member member function from a CallExpr. (#166101)

There's a bug illustrated by this example:

```
template <typename T>
struct Holder {
	T value;
	
	T& operator*() { return value; }
};

struct X {
	using Dispatch = float (X::*)() [[clang::nonblocking]];
    
	void fails(Holder<Dispatch>& holder) [[clang::nonblocking]]
	{
		(this->*(*holder))();   <<< the expression is incorrectly determined not to be nonblocking
	}

	void succeeds(Holder<Dispatch>& holder) [[clang::nonblocking]]
	{
		auto func = *holder;
		(this->*func)();
	}
};
```

In both cases we have a `CXXMemberCallExpr`. In `succeeds`, the
expression refers to a `Decl` (`func`) and gets a useful PTMF type. In
`fails`, the expression does not refer to a `Decl` and its type is
special, printed as `bound member function`. `Expr` provides a method
for extracting the true type so we can use that in this situation.

---------

Co-authored-by: Doug Wyatt <dwyatt@apple.com>
Co-authored-by: Sirraide <aeternalmail@gmail.com>

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