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

src/parsing/parsing.h

 // 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_PARSING_PARSING_H_
 #define V8_PARSING_PARSING_H_
 
 #include "src/globals.h"
 
 namespace v8 {
 namespace internal {
 
 class ParseInfo;
 
 namespace parsing {
 
 // Parses the top-level source code represented by the parse info and sets its
 // function literal.  Returns false (and deallocates any allocated AST
-// nodes) if parsing failed.
-V8_EXPORT_PRIVATE bool ParseProgram(ParseInfo* info);
+// nodes) if parsing failed. Internalizes AST nodes on the heap if
+// |internalize|.
+V8_EXPORT_PRIVATE bool ParseProgram(ParseInfo* info, bool internalize = true);
 
-// Like ParseProgram but for an individual function.
-V8_EXPORT_PRIVATE bool ParseFunction(ParseInfo* info);
+// Like ParseProgram but for an individual function. Internalizes AST nodes on
+// the heap if |internalize|.
+V8_EXPORT_PRIVATE bool ParseFunction(ParseInfo* info, bool internalize = true);
 
 // If you don't know whether info->is_toplevel() is true or not, use this method
 // to dispatch to either of the above functions. Prefer to use the above methods
-// whenever possible.
-V8_EXPORT_PRIVATE bool ParseAny(ParseInfo* info);
+// whenever possible. Internalizes AST nodes on the heap if |internalize|.
+V8_EXPORT_PRIVATE bool ParseAny(ParseInfo* info, bool internalize = true);
 
 }  // namespace parsing
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSING_H_