Move remaining helpers to BackendHelpers

pkg/compiler/lib/src/ssa/invoke_dynamic_specializers.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.
 
 part of ssa;
 
 /**
  * [InvokeDynamicSpecializer] and its subclasses are helpers to
  * optimize intercepted dynamic calls. It knows what input types
  * would be beneficial for performance, and how to change a invoke
@@ skipping 220 matching lines @@
     return left.isUInt31(compiler) && right.isUInt31(compiler);
   }
 
   HInstruction newBuiltinVariant(HInvokeDynamic instruction, Compiler compiler);
 
   Selector renameToOptimizedSelector(String name,
                                      Selector selector,
                                      Compiler compiler) {
     if (selector.name == name) return selector;
     JavaScriptBackend backend = compiler.backend;
-    return new Selector.call(new Name(name, backend.interceptorsLibrary),
+    return new Selector.call(
+        new Name(name, backend.helpers.interceptorsLibrary),
         new CallStructure(selector.argumentCount));
   }
 }
 
 class AddSpecializer extends BinaryArithmeticSpecializer {
   const AddSpecializer();
 
   TypeMask computeTypeFromInputTypes(HInvokeDynamic instruction,
                                      Compiler compiler) {
     if (inputsAreUInt31(instruction, compiler)) {
@@ skipping 508 matching lines @@
     return constantSystem.codeUnitAt;
   }
 
   HInstruction tryConvertToBuiltin(HInvokeDynamic instruction,
                                    Compiler compiler) {
     // TODO(sra): Implement a builtin HCodeUnitAt instruction and the same index
     // bounds checking optimizations as for HIndex.
     return null;
   }
 }