Follow macro invocations when checking if a violation happened in a .cc file.

tools/clang/plugins/FindBadConstructsAction.cpp

Index: tools/clang/plugins/FindBadConstructsAction.cpp
diff --git a/tools/clang/plugins/FindBadConstructsAction.cpp b/tools/clang/plugins/FindBadConstructsAction.cpp
index 9fe660526ca985904341deb932f269612e705ad0..443eecc6884a4ba9fb540ef9d585a93706bd6d55 100644
--- a/tools/clang/plugins/FindBadConstructsAction.cpp
+++ b/tools/clang/plugins/FindBadConstructsAction.cpp
@@ -59,6 +59,8 @@ bool FindBadConstructsAction::ParseArgs(const CompilerInstance& instance,
       options_.with_ast_visitor = true;
     } else if (args[i] == "check-templates") {
       options_.check_templates = true;
+    } else if (args[i] == "follow-macro-expansion") {
+      options_.follow_macro_expansion = true;
     } else {
       parsed = false;
       llvm::errs() << "Unknown clang plugin argument: " << args[i] << "\n";