Ensure types are canonicalized when canonicalization is requested and the type is already finalized.

(Reduces initial heap size by about 15k)
Review URL: https://chromiumcodereview.appspot.com//10886038

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@11544 260f80e4-7a28-3924-810f-c04153c831b5

runtime/vm/class_finalizer.cc

@@ -535,6 +535,10 @@ RawAbstractType* ClassFinalizer::FinalizeType(const Class& cls,
                                               const AbstractType& type,
                                               FinalizationKind finalization) {
   if (type.IsFinalized()) {
+    // Ensure type is canonical if canonicalization is requested.
+    if (finalization >= kCanonicalize) {
+      return type.Canonicalize();
+    }
     return type.raw();
   }
   ASSERT(type.IsResolved());