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

sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart

Index: sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart b/sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart
index e80aa26c07ceefceb645a8e015afceec421ea788..f2b285d72da7dcf0aa25760d6fb318562c305017 100644
--- a/sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart
+++ b/sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart
@@ -812,8 +812,16 @@ class IrBuilder extends ResolvedVisitor<ir.Primitive> {
 
   ir.Primitive visitIdentifier(ast.Identifier node) {
     assert(isOpen);
-    assert(node.isThis());
-    return lookupThis();
+    if (node.isThis()) {
+      return lookupThis();
+    } else if (node.isSuper()) {
+      return lookupSuper();
+    } else {
+      // super and this are the only identifiers that should be met by the
+      // visitor.
+      assert(false);
+      return null;
+    }
   }
 
   ir.Primitive visitParenthesizedExpression(
@@ -848,6 +856,12 @@ class IrBuilder extends ResolvedVisitor<ir.Primitive> {
     return result;
   }
 
+  ir.Primitive lookupSuper() {
+    ir.Primitive result = new ir.Super();
+    add(new ir.LetPrim(result));
+    return result;
+  }
+
   ir.Primitive lookupLocal(Element element) {
     int index = variableIndex[element];
     ir.Primitive value = assignedVars[index];
@@ -896,8 +910,8 @@ class IrBuilder extends ResolvedVisitor<ir.Primitive> {
 
   ir.Primitive visitDynamicSend(ast.Send node) {
     assert(isOpen);
-    if (node.receiver == null || node.receiver.isSuper()) {
-      return giveup(node, 'DynamicSend without receiver, or super receiver');
+    if (node.receiver == null) {
+      return giveup(node, 'DynamicSend without receiver');
     }
     Selector selector = elements.getSelector(node);
     ir.Primitive receiver = visit(node.receiver);
@@ -1122,7 +1136,11 @@ class IrBuilder extends ResolvedVisitor<ir.Primitive> {
 
   ir.Primitive visitSuperSend(ast.Send node) {
     assert(isOpen);
-    return giveup(node, 'SuperSend');
+    if (node.isPropertyAccess) {
+      return visitGetterSend(node);
+    } else {
+      return visitDynamicSend(node);
+    }
   }
 
   ir.Primitive visitTypeReferenceSend(ast.Send node) {
@@ -1181,7 +1199,7 @@ class IrBuilder extends ResolvedVisitor<ir.Primitive> {
         return giveup(node, 'SendSet: non-local, non-static, but no receiver');
       } else {
         if (element != null && Elements.isUnresolved(element)) {
-          return giveup(node);
+          return giveup(node, 'SendSet: non-local, non-static, unresolved');
         }
 
         // Setter or index-setter invocation
@@ -1308,8 +1326,10 @@ class IrBuilder extends ResolvedVisitor<ir.Primitive> {
   ir.FunctionDefinition nullIfGiveup(ir.FunctionDefinition action()) {
     try {
       return action();
-    } catch(e) {
-      if (e == ABORT_IRNODE_BUILDER) return null;
+    } catch(e, tr) {
+      if (e == ABORT_IRNODE_BUILDER) {
+        return null;
+      }
       rethrow;
     }
   }