Ensure constructorName symbols include private manglings.

runtime/lib/mirrors_impl.dart

Index: runtime/lib/mirrors_impl.dart
diff --git a/runtime/lib/mirrors_impl.dart b/runtime/lib/mirrors_impl.dart
index 85bbae8387d0bdcee6a7ab820692fef7ebdcf681..754a7a7316dad6444e1c42536ca26c50f0de44a8 100644
--- a/runtime/lib/mirrors_impl.dart
+++ b/runtime/lib/mirrors_impl.dart
@@ -586,6 +586,10 @@ class _LocalClassMirrorImpl extends _LocalObjectMirrorImpl
     return _superinterfaces;
   }
 
+  _unmangleQualified(Symbol s) {
+    return _n(s).split('.').map((n) => MirrorSystem.getName(_s(n))).join('.');
+  }
+
   get _mixinApplicationName {
     var mixins = new List<ClassMirror>();
     var klass = this;
@@ -593,10 +597,12 @@ class _LocalClassMirrorImpl extends _LocalObjectMirrorImpl
       mixins.add(klass.mixin);
       klass = klass.superclass;
     }
+    // Strip out the private manglings early, but the VM's unmangling routine
+    // can't cope with them.
     return _s(
-      _n(klass.qualifiedName)
+      _unmangleQualified(klass.qualifiedName)
       + ' with '
-      + mixins.reversed.map((m)=>_n(m.qualifiedName)).join(', '));
+      + mixins.reversed.map((m)=>_unmangleQualified(m.qualifiedName)).join(', '));
   }
 
   var _mixin;
@@ -1336,7 +1342,8 @@ class _LocalMethodMirrorImpl extends _LocalDeclarationMirrorImpl
               'Internal error in MethodMirror.constructorName: '
               'malformed name <$simpleName>');
         } else if (parts.length == 2) {
-          _constructorName = _s(parts[1]);
+          LibraryMirror definingLibrary = owner.owner;
+          _constructorName = MirrorSystem.getSymbol(parts[1], definingLibrary);
         } else {
           _constructorName = _s('');
         }