Fix order of output of references with invokeMethodRef.

pkg/analyzer/lib/src/summary/summarize_const_expr.dart

Index: pkg/analyzer/lib/src/summary/summarize_const_expr.dart
diff --git a/pkg/analyzer/lib/src/summary/summarize_const_expr.dart b/pkg/analyzer/lib/src/summary/summarize_const_expr.dart
index f76fed2ec7af5546ff1d28960e9054a36e89b07b..e65e33a71c93dcbc250a8568466bcd79fa78e960 100644
--- a/pkg/analyzer/lib/src/summary/summarize_const_expr.dart
+++ b/pkg/analyzer/lib/src/summary/summarize_const_expr.dart
@@ -467,8 +467,8 @@ abstract class AbstractConstExprSerializer {
     ArgumentList argumentList = invocation.argumentList;
     if (_isIdentifierSequence(methodName)) {
       EntityRefBuilder ref = serializeIdentifierSequence(methodName);
-      references.add(ref);
       _serializeArguments(argumentList);
+      references.add(ref);
       operations.add(UnlinkedConstOperation.invokeMethodRef);
     } else {
       if (!invocation.isCascaded) {