Do not rename assert syntax.

lib/compiler/implementation/dart_backend/placeholder_collector.dart

 // Copyright (c) 2012, 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.
 
 class LocalPlaceholder implements Hashable {
   final String identifier;
   final Set<Node> nodes;
   LocalPlaceholder(this.identifier) : nodes = new Set<Node>();
   int hashCode() => identifier.hashCode();
   String toString() =>
@@ skipping 13 matching lines @@
 
 class DeclarationTypePlaceholder {
   final TypeAnnotation typeNode;
   final bool requiresVar;
   DeclarationTypePlaceholder(this.typeNode, this.requiresVar);
 }
 
 class SendVisitor extends ResolvedVisitor {
   final PlaceholderCollector collector;
 
+  get compiler => collector.compiler;
+
   SendVisitor(this.collector, TreeElements elements) : super(elements);
 
   visitOperatorSend(Send node) {}
   visitForeignSend(Send node) {}
 
   visitSuperSend(Send node) {
     collector.tryMakeMemberPlaceholder(node.selector);
   }
 
   visitDynamicSend(Send node) {
@@ skipping 33 matching lines @@
           collector.tryMakeLocalPlaceholder(element, node.selector);
         } else {
           assert(node.selector is FunctionExpression);
         }
       }
     }
   }
 
   visitStaticSend(Send node) {
     final element = elements[node];
-    if (Elements.isUnresolved(element)) {
+    if (Elements.isUnresolved(element) || element === compiler.assertMethod) {
       return;
     }
     if (element.isConstructor() || element.isFactoryConstructor()) {
       // Rename named constructor in redirection position:
       // class C { C.named(); C.redirecting() : this.named(); }
       if (node.receiver is Identifier
           && node.receiver.asIdentifier().isThis()) {
         assert(node.selector is Identifier);
         collector.tryMakeMemberPlaceholder(node.selector);
       }
@@ skipping 470 matching lines @@
 
   visitBlock(Block node) {
     for (Node statement in node.statements.nodes) {
       if (statement is VariableDefinitions) {
         makeVarDeclarationTypePlaceholder(statement);
       }
     }
     node.visitChildren(this);
   }
 }