Add basic compilation support for modules

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index ddb542de35cb5492d9afdf350bd504b772475bbb..629e9b3c10313b411c9d19253804180ce998cfd9 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -746,12 +746,12 @@ class Parser : public ParserBase<ParserTraits> {
   // which is set to false if parsing failed; it is unchanged otherwise.
   // By making the 'exception handling' explicit, we are forced to check
   // for failure at the call sites.
-  void* ParseStatementList(ZoneList<Statement*>* processor, int end_token,
+  void* ParseStatementList(ZoneList<Statement*>* body, int end_token,
                            bool is_eval, Scope** ad_hoc_eval_scope, bool* ok);
   Statement* ParseStatementListItem(bool* ok);
-  Module* ParseModule(bool* ok);
+  Statement* ParseModule(bool* ok);
   Statement* ParseModuleItem(bool* ok);
-  Module* ParseModuleSpecifier(bool* ok);
+  Literal* ParseModuleSpecifier(bool* ok);
   Statement* ParseImportDeclaration(bool* ok);
   Statement* ParseExportDeclaration(bool* ok);
   Statement* ParseExportDefault(bool* ok);