Don't forget to add the HStatic to the graph.

lib/compiler/implementation/ssa/optimize.dart

 // Copyright (c) 2011, 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.
 
 interface OptimizationPhase {
   String get name();
   void visitGraph(HGraph graph);
 }
 
 class SsaOptimizerTask extends CompilerTask {
@@ skipping 243 matching lines @@
         // operator.
         return visitInvokeBinary(node);
       } else if (right.isConstantNull()) {
         return graph.addConstantBool(false);
       } else {
         // We can just emit an identity check because the type does
         // not implement operator=.
         // TODO(floitsch): cache interceptors.
         HStatic target = new HStatic(
             compiler.builder.interceptors.getTripleEqualsInterceptor());
+        node.block.addBefore(node, target);
         return new HIdentity(target, left, right);
       }
     }
 
 
     if (right.isConstantNull()) {
       if (left.propagatedType.isUseful()) {
         return graph.addConstantBool(false);
       } else {
         // TODO(floitsch): cache interceptors.
         HStatic target = new HStatic(
             compiler.builder.interceptors.getEqualsNullInterceptor());
-        node.block.addBefore(node,target);
+        node.block.addBefore(node, target);
         return new HEquals(target, node.left, node.right);
       }
     }
 
     // All other cases are dealt with by the [visitInvokeBinary].
     return visitInvokeBinary(node);
   }
 
   HInstruction visitTypeGuard(HTypeGuard node) {
     HInstruction value = node.guarded;
@@ skipping 524 matching lines @@
         }
       }
       if (!canBeMoved) continue;
 
       // This is safe because we are running after GVN.
       // TODO(ngeoffray): ensure GVN has been run.
       set_.add(current);
     }
   }
 }