Remove GenerateBooleanCheck() since we have a boolean map now.

src/stub-cache.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "v8.h"
 
 #include "api.h"
 #include "arguments.h"
 #include "ast.h"
 #include "code-stubs.h"
@@ skipping 766 matching lines @@
     Label* miss) {
   PrototypeCheckType check_type = CHECK_ALL_MAPS;
   int function_index = -1;
   if (type->Is(HeapType::String())) {
     function_index = Context::STRING_FUNCTION_INDEX;
   } else if (type->Is(HeapType::Symbol())) {
     function_index = Context::SYMBOL_FUNCTION_INDEX;
   } else if (type->Is(HeapType::Number())) {
     function_index = Context::NUMBER_FUNCTION_INDEX;
   } else if (type->Is(HeapType::Boolean())) {
-    // Booleans use the generic oddball map, so an additional check is needed to
-    // ensure the receiver is really a boolean.
-    GenerateBooleanCheck(object_reg, miss);
     function_index = Context::BOOLEAN_FUNCTION_INDEX;
   } else {
     check_type = SKIP_RECEIVER;
   }
 
   if (check_type == CHECK_ALL_MAPS) {
     GenerateDirectLoadGlobalFunctionPrototype(
         masm(), function_index, scratch1(), miss);
     Object* function = isolate()->native_context()->get(function_index);
     Object* prototype = JSFunction::cast(function)->instance_prototype();
@@ skipping 684 matching lines @@
           Handle<FunctionTemplateInfo>(
               FunctionTemplateInfo::cast(signature->receiver()));
     }
   }
 
   is_simple_api_call_ = true;
 }
 
 
 } }  // namespace v8::internal