[clang-tools-extra] [clang-tidy] Improve readability-enum-initial-value diagnostic message (PR #176485)

[Baranov Victor via cfe-commits]

================
@@ -15,6 +15,7 @@
 #include "clang/Basic/SourceLocation.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/SmallVector.h"
----------------
vbvictor wrote:

We have new line
`llvm::SmallVector<StringRef, 4> UninitializedNames;`.
Apart from it, we have `misc-include-cleaner` that whould deal with unused headers

https://github.com/llvm/llvm-project/pull/176485