[clang-tools-extra] [clang-tidy][NFC] Don't qualify names unless strictly necessary (PR #185169)

[Baranov Victor via cfe-commits]

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@@ -15,17 +15,17 @@ namespace custom {
 // will changed dynamically when switching to different source file.
 static void registerCustomChecks(const ClangTidyOptions &Options,
                                  ClangTidyCheckFactories &Factories) {
-  static llvm::SmallSet<llvm::SmallString<32>, 8> CustomCheckNames{};
+  static llvm::SmallSet<SmallString<32>, 8> CustomCheckNames{};
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vbvictor wrote:

Same for SmallSet?

https://github.com/llvm/llvm-project/pull/185169