[clang] [clang-format] Correctly annotate static overloaded operator calls (PR #161944)

[via cfe-commits]

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@@ -3802,7 +3802,7 @@ static bool isFunctionDeclarationName(const LangOptions &LangOpts,
   const auto *Prev = Current.getPreviousNonComment();
   assert(Prev);
 
-  if (Prev->is(tok::coloncolon))
+  if (Prev->is(tok::coloncolon) && Prev->hasWhitespaceBefore())
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owenca wrote:

Yes, because it _is_ a function declaration there. So we annotate this kind of constructs as follows:
```c++
Foo::operator()();  // function call
Bar ::operator<<(); // function declaration
```

https://github.com/llvm/llvm-project/pull/161944