Do not look for the slot in the ScopeInfo's global range when it's not necessary.

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 284 matching lines @@
 // the subsequent slots 1..used contain ScriptContexts.
 class ScriptContextTable : public FixedArray {
  public:
   // Conversions.
   static inline ScriptContextTable* cast(Object* context);
 
   struct LookupResult {
     int context_index;
     int slot_index;
     VariableMode mode;
-    VariableLocation location;
     InitializationFlag init_flag;
     MaybeAssignedFlag maybe_assigned_flag;
   };
 
   inline int used() const;
   inline void set_used(int used);
 
   static inline Handle<Context> GetContext(Handle<ScriptContextTable> table,
                                            int i);
 
@@ skipping 266 matching lines @@
   static bool IsBootstrappingOrGlobalObject(Isolate* isolate, Object* object);
 #endif
 
   STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize);
   STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CONTEXTS_H_