Constrained variant interface dispatch dispatches to wrong method

See the test added in #121167. I'm going to ActiveIssue the test on this issue.

```csharp
using Xunit;

namespace SimpleStaticVirtual
{
public class Tests
{
[Fact]
public static void TestEntryPoint()
{
Assert.Equal(nameof(IGetter), Get());
Assert.Equal("Object", GetVariant, string>());
}

static string Get() where T : IGetter => T.Get();
static string GetVariant() where T : IGetter => T.Get();
}

interface IGetter
{
static virtual string Get() => nameof(IGetter);
}

interface IGetter
{
static virtual string Get() => typeof(T).Name;
}
}
```