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

src/parsing/parsing.h

Index: src/parsing/parsing.h
diff --git a/src/parsing/parsing.h b/src/parsing/parsing.h
index 1f92c51838946af3944e560bf2a509c6217be030..3902377e0de0a576d187b8f3ad44a23116d7df54 100644
--- a/src/parsing/parsing.h
+++ b/src/parsing/parsing.h
@@ -16,16 +16,18 @@ 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