Find All References thinks two references are different if a template argument has a different typedef

[sean-mcmanus]

Repro is find all references on func1 below (found by Copilot via C/C++ DevTools):

test1.h:

template <typename T>
struct vector1 {
    T t;
};
template <typename T>
struct basic_string1 {};
using string1 = basic_string1<char>;

test1.cpp:

#include "test1.h"

void func1(vector1<string1> &a) {}

test2.cpp

#include "test1.h"
using u8string1 = vector1<basic_string1<char>>;
extern void func1(vector1<string1> &a);

int func2()
{
    vector1<string1> v;
    func1(v);
}

Bug: The implementation ends up comparing string1 with u8string1 as not being equal. The bug doesn't repro with VS, which has a different implementation which somehow resolves the comparison correctly.