Move ContextSlotCache to its own file

src/ast/context-slot-cache.h

Index: src/ast/context-slot-cache.h
diff --git a/src/ast/scopeinfo.h b/src/ast/context-slot-cache.h
similarity index 94%
copy from src/ast/scopeinfo.h
copy to src/ast/context-slot-cache.h
index bafbaff2e742d87d4d8476fba80d96b254cde129..8e9d1f7a8b88259df0f6d6e0d89c5544d67802eb 100644
--- a/src/ast/scopeinfo.h
+++ b/src/ast/context-slot-cache.h
@@ -1,9 +1,9 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2016 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_AST_SCOPEINFO_H_
-#define V8_AST_SCOPEINFO_H_
+#ifndef V8_AST_CONTEXT_SLOT_CACHE_H_
+#define V8_AST_CONTEXT_SLOT_CACHE_H_
 
 #include "src/allocation.h"
 #include "src/ast/modules.h"
@@ -107,8 +107,7 @@ class ContextSlotCache {
   DISALLOW_COPY_AND_ASSIGN(ContextSlotCache);
 };
 
-
 }  // namespace internal
 }  // namespace v8
 
-#endif  // V8_AST_SCOPEINFO_H_
+#endif  // V8_AST_CONTEXT_SLOT_CACHE_H_