Use a different map to distinguish eval contexts

src/contexts.h

 // 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.
 
 #ifndef V8_CONTEXTS_H_
 #define V8_CONTEXTS_H_
 
 #include "src/heap/heap.h"
 #include "src/objects.h"
 
@@ skipping 519 matching lines @@
   // Predicates for context types.  IsNativeContext is also defined on Object
   // because we frequently have to know if arbitrary objects are natives
   // contexts.
   inline bool IsNativeContext();
   inline bool IsFunctionContext();
   inline bool IsCatchContext();
   inline bool IsWithContext();
   inline bool IsDebugEvaluateContext();
   inline bool IsBlockContext();
   inline bool IsModuleContext();
+  inline bool IsEvalContext();
   inline bool IsScriptContext();
 
   inline bool HasSameSecurityTokenAs(Context* that);
 
   // A native context holds a list of all functions with optimized code.
   void AddOptimizedFunction(JSFunction* function);
   void RemoveOptimizedFunction(JSFunction* function);
   void SetOptimizedFunctionsListHead(Object* head);
   Object* OptimizedFunctionsListHead();
 
@@ skipping 99 matching lines @@
   STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize);
   STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex);
 };
 
 typedef Context::Field ContextField;
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CONTEXTS_H_