[clang-tools-extra] Add option to exclude headers from clang-tidy analysis (PR #91400)

[Piotr Zegar via cfe-commits]

================
@@ -578,6 +579,13 @@ llvm::Regex 
*ClangTidyDiagnosticConsumer::getHeaderFilter() {
   return HeaderFilter.get();
 }
 
+llvm::Regex *ClangTidyDiagnosticConsumer::getExcludeHeaderFilter() {
+  if (!ExcludeHeaderFilter)
+    ExcludeHeaderFilter = std::make_unique<llvm::Regex>(
+        *Context.getOptions().ExcludeHeaderFilterRegex);
----------------
PiotrZSL wrote:

what if ExcludeHeaderFilterRegex is not set ? This look like legacy bug, same 
as in getHeaderFilter

https://github.com/llvm/llvm-project/pull/91400
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