dart2js cps: Remove NonTailThrow.

pkg/compiler/lib/src/cps_ir/cps_ir_builder.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.ir_builder;
 
 import '../compile_time_constants.dart' show BackendConstantEnvironment;
 import '../constants/constant_system.dart';
 import '../constants/values.dart' show ConstantValue, PrimitiveConstantValue;
 import '../dart_types.dart';
@@ skipping 2080 matching lines @@
   }
 
   void buildThrow(ir.Primitive value) {
     assert(isOpen);
     add(new ir.Throw(value));
     _current = null;
   }
 
   ir.Primitive buildNonTailThrow(ir.Primitive value) {
     assert(isOpen);
-    return addPrimitive(new ir.NonTailThrow(value));
+    ir.Parameter param = new ir.Parameter(null);
+    ir.Continuation cont = new ir.Continuation(<ir.Parameter>[param]);
+    add(new ir.LetCont(cont, new ir.Throw(value)));
+    return param;
   }
 
   void buildRethrow() {
     assert(isOpen);
     add(new ir.Rethrow());
     _current = null;
   }
 
   /// Create a negation of [condition].
   ir.Primitive buildNegation(ir.Primitive condition) {
@@ skipping 648 matching lines @@
 }
 
 class SwitchCaseInfo {
   final List<ir.Primitive> constants = <ir.Primitive>[];
   final SubbuildFunction buildBody;
 
   SwitchCaseInfo(this.buildBody);
 
   void addConstant(ir.Primitive constant) => constants.add(constant);
 }