Bug 1530389 - Enclose BinAST code in Parser.h with JS_BUILD_BINAST. r=Yoric

Differential Revision: https://phabricator.services.mozilla.com/D21091

--HG--
extra : moz-landing-system : lando

js/src/frontend/Parser.h

@@ -269,8 +269,11 @@ class MOZ_STACK_CLASS ParserSharedBase : private JS::AutoGCRooter {
   // This is needed to cast a parser to JS::AutoGCRooter.
   friend void js::frontend::TraceParser(JSTracer* trc,
                                         JS::AutoGCRooter* parser);
+
+#if defined(JS_BUILD_BINAST)
   friend void js::frontend::TraceBinParser(JSTracer* trc,
                                            JS::AutoGCRooter* parser);
+#endif  // JS_BUILD_BINAST
 
  private:
   // Create a new traceable node and store it into the trace list.