Restore lazy parsing of classes.

dart/lib/compiler/implementation/compiler.dart

Index: dart/lib/compiler/implementation/compiler.dart
diff --git a/dart/lib/compiler/implementation/compiler.dart b/dart/lib/compiler/implementation/compiler.dart
index 9fde73ab5ab4e38ebd50a9bc6f0c00d1dbb1eb95..1c1b8339e061d3d2869066552b4b147ad9e4121f 100644
--- a/dart/lib/compiler/implementation/compiler.dart
+++ b/dart/lib/compiler/implementation/compiler.dart
@@ -580,10 +580,6 @@ class Compiler implements DiagnosticListener {
       });
     }
 
-    // TODO(ahe): Remove this line. Eventually, enqueuer.resolution
-    // should know this.
-    world.populate(this, libraries.getValues());
-
     log('Resolving...');
     phase = PHASE_RESOLVING;
     backend.enqueueHelpers(enqueuer.resolution);
@@ -595,6 +591,10 @@ class Compiler implements DiagnosticListener {
     log('Inferring types...');
     typesTask.onResolutionComplete();
 
+    // TODO(ahe): Remove this line. Eventually, enqueuer.resolution
+    // should know this.
+    world.populate(this);
+
     log('Compiling...');
     phase = PHASE_COMPILING;
     processQueue(enqueuer.codegen, main);