Add support for superSend to the new IR and dart backend.

sdk/lib/_internal/compiler/implementation/dart_backend/dart_codegen.dart

Index: sdk/lib/_internal/compiler/implementation/dart_backend/dart_codegen.dart
diff --git a/sdk/lib/_internal/compiler/implementation/dart_backend/dart_codegen.dart b/sdk/lib/_internal/compiler/implementation/dart_backend/dart_codegen.dart
index 4906aaaaaf0a1b4780e0234bb492cd6977a940dc..42febb740c68a2e2cf8aa2e6dd10979bb936e5d7 100644
--- a/sdk/lib/_internal/compiler/implementation/dart_backend/dart_codegen.dart
+++ b/sdk/lib/_internal/compiler/implementation/dart_backend/dart_codegen.dart
@@ -389,8 +389,7 @@ class ASTEmitter extends tree.Visitor<dynamic, Expression> {
     }
   }
 
-  Expression visitInvokeMethod(tree.InvokeMethod exp) {
-    Expression receiver = visitExpression(exp.receiver);
+  Expression emitMethodCall(tree.Invoke exp, Receiver receiver) {
     List<Argument> args = emitArguments(exp);
     switch (exp.selector.kind) {
       case SelectorKind.CALL:
@@ -429,6 +428,15 @@ class ASTEmitter extends tree.Visitor<dynamic, Expression> {
     }
   }
 
+  Expression visitInvokeMethod(tree.InvokeMethod exp) {
+    Expression receiver = visitExpression(exp.receiver);
+    return emitMethodCall(exp, receiver);
+  }
+
+  Expression visitInvokeSuperMethod(tree.InvokeSuperMethod exp) {
+    return emitMethodCall(exp, new SuperReceiver());
+  }
+
   Expression visitInvokeConstructor(tree.InvokeConstructor exp) {
     List args = emitArguments(exp);
     FunctionElement constructor = exp.target;