[clang] [Clang] Bypass TAD during overload resolution if a perfect match exists (PR #136203)

[Alexander Kornienko via cfe-commits]

alexfh wrote:

This commit changed the behavior of the following code (https://godbolt.org/z/r1q55e1jv / https://godbolt.org/z/GsPqxaf3G):
```
#include <vector>

constexpr unsigned long num = 123;

void foo() {
    // OK
    (void)std::vector<unsigned long>({num});

    // Fail
    (void)std::vector<long>({num});
}
```
In the second case Clang choses a different vector constructor. See also https://godbolt.org/z/ecWo4E6z4.

Is this change in the behavior expected?

https://github.com/llvm/llvm-project/pull/136203