Fix dump of discovered macros

Author: robertoraggi

src/frontend/cxx/frontend.cc

@@ -294,7 +294,6 @@ auto runOnFile(const CLI& cli, const std::string& fileName) -> bool {
       shouldExit = true;
     } else {
       unit.setSource(std::move(*source), fileName);
-
       if (cli.opt_dM) {
         preprocessor->printMacros(output);
         shouldExit = true;

src/parser/cxx/translation_unit.cc

@@ -93,7 +93,6 @@ auto TranslationUnit::continuePreprocessing() -> PreprocessingState {
 
 void TranslationUnit::endPreprocessing() {
   preprocessor_->endPreprocessing(tokens_);
-  preprocessor_->squeeze();
 }
 
 auto TranslationUnit::fatalErrors() const -> bool {
@@ -168,7 +167,7 @@ void TranslationUnit::parse(ParserConfiguration config) {
   if (ast_) {
     cxx_runtime_error("translation unit already parsed");
   }
-
+  preprocessor_->squeeze();
   Parser parse(this);
   parse.setConfig(std::move(config));
   parse(ast_);