tree 80b969f277249a07581d7004174f0c001973b25d
parent 0a052ffc91910bc1de62d4e9dc851b7696472d8e
author Krystian Stasiowski <sdkrystian@gmail.com> 1715126959 -0400
committer Copybara-Service <copybara-worker@google.com> 1715127106 -0700

[Clang][Sema] Don't set instantiated from function when rewriting operator<=> (#91339)

The following snippet causes a crash:
```
template<typename T>
struct A
{
    bool operator<=>(const A&) const requires true = default;
};

bool f(A<int> a)
{
    return a != A<int>();
}
```
This occurs because during the rewrite from `operator<=>` to
`operator==`, the "pattern" `operator<=>` function is set as the
instantiated from function for the newly created `operator==` function.
This is obviously incorrect, and this patch fixes it.

GitOrigin-RevId: d4cf20ca37160cb062a9db773d0e6255d6bbc31a