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 074b264e385a95599a28167ea1ee983d7ec7fcd4..c1e43681fb2e2f5f99d5afbf9d9e119ef6b32f07 100644
--- a/tools/clang/plugins/FindBadConstructsAction.cpp
+++ b/tools/clang/plugins/FindBadConstructsAction.cpp
@@ -62,6 +62,8 @@ 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";