[clang-tools-extra] [clang-tidy] Preserve typedef comments in `modernize-use-using` (PR #180372)

[Baranov Victor via cfe-commits]

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@@ -160,6 +160,86 @@ getTrailingCommentsInRange(CharSourceRange Range, const SourceManager &SM,
   return Comments;
 }
 
+std::string getSourceText(CharSourceRange Range, const SourceManager &SM,
+                          const LangOptions &LangOpts) {
+  if (!Range.isValid())
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vbvictor wrote:

ditto elsewhere

https://github.com/llvm/llvm-project/pull/180372