[ast] Allow dereferencing handles in Print helper.

src/ast/ast.cc

 // 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.
 
 #include "src/ast/ast.h"
 
 #include <cmath>  // For isfinite.
 
 #include "src/ast/compile-time-value.h"
 #include "src/ast/prettyprinter.h"
@@ skipping 33 matching lines @@
     default:
       break;
   }
 
   return "UnknownIntrinsicIndex";
 }
 
 void AstNode::Print() { Print(Isolate::Current()); }
 
 void AstNode::Print(Isolate* isolate) {
+  AllowHandleDereference allow_deref;
   AstPrinter::PrintOut(isolate, this);
 }
 
 
 #endif  // DEBUG
 
 #define RETURN_NODE(Node) \
   case k##Node:           \
     return static_cast<Node*>(this);
 
@@ skipping 1049 matching lines @@
 #ifdef DEBUG
   return is_jsruntime() ? NameForNativeContextIntrinsicIndex(context_index_)
                         : function_->name;
 #else
   return is_jsruntime() ? "(context function)" : function_->name;
 #endif  // DEBUG
 }
 
 }  // namespace internal
 }  // namespace v8