Use a different map to distinguish eval contexts

src/factory.h

 // Copyright 2014 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.
 
 #ifndef V8_FACTORY_H_
 #define V8_FACTORY_H_
 
 #include "src/globals.h"
 #include "src/isolate.h"
 #include "src/messages.h"
@@ skipping 270 matching lines @@
   Handle<ScriptContextTable> NewScriptContextTable();
 
   // Create a module context.
   Handle<Context> NewModuleContext(Handle<Module> module,
                                    Handle<JSFunction> function,
                                    Handle<ScopeInfo> scope_info);
 
   // Create a function context.
   Handle<Context> NewFunctionContext(int length, Handle<JSFunction> function);
 
+  // Create a eval context.
+  Handle<Context> NewEvalContext(int length, Handle<JSFunction> function);
+
   // Create a catch context.
   Handle<Context> NewCatchContext(Handle<JSFunction> function,
                                   Handle<Context> previous,
                                   Handle<ScopeInfo> scope_info,
                                   Handle<String> name,
                                   Handle<Object> thrown_object);
 
   // Create a 'with' context.
   Handle<Context> NewWithContext(Handle<JSFunction> function,
                                  Handle<Context> previous,
@@ skipping 487 matching lines @@
                                      FunctionMode function_mode);
 
   void SetStrictFunctionInstanceDescriptor(Handle<Map> map,
                                            FunctionMode function_mode);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_FACTORY_H_