Support serialization of all resolved asts from dart:core

pkg/compiler/lib/src/ssa/builder.dart

Index: pkg/compiler/lib/src/ssa/builder.dart
diff --git a/pkg/compiler/lib/src/ssa/builder.dart b/pkg/compiler/lib/src/ssa/builder.dart
index 2c9de0abd5f966913970713e7cbc20dbdda4a409..cb6a80e349b7a9578bf38d2a131d3739648371f4 100644
--- a/pkg/compiler/lib/src/ssa/builder.dart
+++ b/pkg/compiler/lib/src/ssa/builder.dart
@@ -4884,10 +4884,10 @@ class SsaBuilder extends ast.Visitor
         constructorDeclaration == helpers.jsArrayTypedConstructor;
 
     if (isSymbolConstructor) {
-      constructor = compiler.symbolValidatedConstructor;
+      constructor = helpers.symbolValidatedConstructor;
       assert(invariant(send, constructor != null,
           message: 'Constructor Symbol.validated is missing'));
-      callStructure = compiler.symbolValidatedConstructorSelector.callStructure;
+      callStructure = helpers.symbolValidatedConstructorSelector.callStructure;
       assert(invariant(send, callStructure != null,
           message: 'Constructor Symbol.validated is missing'));
     }