[clang] [clang-tools-extra] [clang-tidy] Avoid matching nodes in system headers (PR #151035)

[Balazs Benics via cfe-commits]

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@@ -1336,6 +1336,44 @@ class MatchASTVisitor : public RecursiveASTVisitor<MatchASTVisitor>,
     return false;
   }
 
+  template <typename T> static SourceLocation getNodeLocation(const T &Node) {
+    return Node.getBeginLoc();
+  }
+
+  static SourceLocation getNodeLocation(const QualType &Node) { return {}; }
+
+  static SourceLocation getNodeLocation(const NestedNameSpecifier &Node) {
+    return {};
+  }
+
+  static SourceLocation getNodeLocation(const CXXCtorInitializer &Node) {
+    return Node.getSourceLocation();
+  }
+
+  static SourceLocation getNodeLocation(const TemplateArgumentLoc &Node) {
+    return Node.getLocation();
+  }
+
+  static SourceLocation getNodeLocation(const Attr &Node) {
+    return Node.getLocation();
+  }
+
+  bool isInSystemHeader(const SourceLocation &Loc) {
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steakhal wrote:

I'm surprised you take a SourceLocation by ref. Isn't we usually take it by value?

https://github.com/llvm/llvm-project/pull/151035