Avoid redundant assertion code in equality comparisons in checked mode.

runtime/vm/flow_graph_builder.cc

 // 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.
 
 #include "vm/flow_graph_builder.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/ast_printer.h"
 #include "vm/bit_vector.h"
 #include "vm/class_finalizer.h"
@@ skipping 1422 matching lines @@
     arguments->Add(push_right);
 
     Definition* result =
         new InstanceCallInstr(node->token_pos(),
                               Symbols::EqualOperator(),
                               Token::kEQ,  // Result is negated later for kNE.
                               arguments,
                               Object::null_array(),
                               2,
                               owner()->ic_data_array());
-    if (FLAG_enable_type_checks) {
-      Value* value = Bind(result);
-      result = new AssertBooleanInstr(node->token_pos(), value);
-    }
-
     if (node->kind() == Token::kNE) {
+      if (FLAG_enable_type_checks) {
+        Value* value = Bind(result);
+        result = new AssertBooleanInstr(node->token_pos(), value);
+      }
       Value* value = Bind(result);
       result = new BooleanNegateInstr(value);
     }
     ReturnDefinition(result);
     return;
   }
 
   ZoneGrowableArray<PushArgumentInstr*>* arguments =
       new ZoneGrowableArray<PushArgumentInstr*>(2);
 
@@ skipping 2425 matching lines @@
   intptr_t len = OS::SNPrint(NULL, 0, kFormat, function_name, reason) + 1;
   char* chars = Isolate::Current()->current_zone()->Alloc<char>(len);
   OS::SNPrint(chars, len, kFormat, function_name, reason);
   const Error& error = Error::Handle(
       LanguageError::New(String::Handle(String::New(chars))));
   Isolate::Current()->long_jump_base()->Jump(1, error);
 }
 
 
 }  // namespace dart