[clang] [llvm] [Sema] Implement support for -Wformat-signedness (PR #74440)

[Yingchi Long via cfe-commits]

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@@ -11815,6 +11815,18 @@ isArithmeticArgumentPromotion(Sema &S, const ImplicitCastExpr *ICE) {
          S.Context.getFloatingTypeOrder(From, To) < 0;
 }
 
+static clang::analyze_format_string::ArgType::MatchKind
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inclyc wrote:

```suggestion
static analyze_format_string::ArgType::MatchKind
```

Maybe we can remove this namespace?

https://github.com/llvm/llvm-project/pull/74440