Handle built-in function identical correctly

runtime/vm/flow_graph_builder.cc

Index: runtime/vm/flow_graph_builder.cc
===================================================================
--- runtime/vm/flow_graph_builder.cc	(revision 21709)
+++ runtime/vm/flow_graph_builder.cc	(working copy)
@@ -1929,30 +1929,6 @@
 // <Expression> ::= StaticCall { function: Function
 //                               arguments: <ArgumentList> }
 void EffectGraphVisitor::VisitStaticCallNode(StaticCallNode* node) {
-  if (node->function().name() == Symbols::Identical().raw()) {
-    // Attempt to replace top level defined 'identical' from the core
-    // library with strict equal early on.
-    // TODO(hausner): Evaluate if this can happen at AST building time.
-    const Class& cls = Class::Handle(node->function().Owner());
-    if (cls.IsTopLevel()) {
-      const Library& core_lib = Library::Handle(Library::CoreLibrary());
-      if (cls.library() == core_lib.raw()) {
-        ASSERT(node->arguments()->length() == 2);
-        ValueGraphVisitor for_left_value(owner(), temp_index());
-        node->arguments()->NodeAt(0)->Visit(&for_left_value);
-        Append(for_left_value);
-        ValueGraphVisitor for_right_value(owner(), temp_index());
-        node->arguments()->NodeAt(1)->Visit(&for_right_value);
-        Append(for_right_value);
-        StrictCompareInstr* comp = new StrictCompareInstr(
-            Token::kEQ_STRICT,
-            for_left_value.value(),
-            for_right_value.value());
-        ReturnDefinition(comp);
-        return;
-      }
-    }
-  }
   ZoneGrowableArray<PushArgumentInstr*>* arguments =
       new ZoneGrowableArray<PushArgumentInstr*>(node->arguments()->length());
   BuildPushArguments(*node->arguments(), arguments);