Reland: [Compiler] Enable handles created during parsing and scope analysis to be deferred.

src/handles.h

 // Copyright 2011 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_HANDLES_H_
 #define V8_HANDLES_H_
 
 #include <type_traits>
 
 #include "include/v8.h"
@@ skipping 343 matching lines @@
   RootIndexMap* root_index_map_;
   IdentityMap<Object**>* identity_map_;
   // Ordinary nested handle scopes within the current one are not canonical.
   int canonical_level_;
   // We may have nested canonical scopes. Handles are canonical within each one.
   CanonicalHandleScope* prev_canonical_scope_;
 
   friend class HandleScope;
 };
 
-
-class DeferredHandleScope final {
+class V8_EXPORT_PRIVATE DeferredHandleScope final {
  public:
   explicit DeferredHandleScope(Isolate* isolate);
   // The DeferredHandles object returned stores the Handles created
   // since the creation of this DeferredHandleScope.  The Handles are
   // alive as long as the DeferredHandles object is alive.
   DeferredHandles* Detach();
   ~DeferredHandleScope();
 
  private:
   Object** prev_limit_;
@@ skipping 38 matching lines @@
     next = limit = NULL;
     sealed_level = level = 0;
     canonical_scope = NULL;
   }
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HANDLES_H_