Revert r1380 that is breaking frog.

runtime/vm/code_generator_ia32.cc

 // 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.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/code_generator.h"
 
 #include "lib/error.h"
@@ skipping 1371 matching lines @@
 // Returns:
 // - true or false on stack.
 void CodeGenerator::GenerateInstanceOf(intptr_t node_id,
                                        intptr_t token_index,
                                        const Type& type,
                                        bool negate_result) {
   ASSERT(type.IsFinalized());
   const Bool& bool_true = Bool::ZoneHandle(Bool::True());
   const Bool& bool_false = Bool::ZoneHandle(Bool::False());
 
-  // All instances are of a subtype of the Object type.
+  // All instances are of type Object.
   const Type& object_type =
       Type::Handle(Isolate::Current()->object_store()->object_type());
   if (type.IsInstantiated() && object_type.IsSubtypeOf(type)) {
+    // All objects are an instance of the Object class.
     __ PushObject(negate_result ? bool_false : bool_true);
     return;
   }
 
   // A NULL object always returns false for all types other than Object
   // (and Null).
   const Immediate raw_null =
       Immediate(reinterpret_cast<intptr_t>(Object::null()));
   Label non_null, done;
   __ cmpl(EAX, raw_null);
@@ skipping 1301 matching lines @@
   const Class& cls = Class::Handle(parsed_function_.function().owner());
   const Script& script = Script::Handle(cls.script());
   Parser::ReportMsg(script, token_index, "Error", error_msg, format, args);
   Isolate::Current()->long_jump_base()->Jump(1, error_msg);
   UNREACHABLE();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32