Reland: [Parse] ParseInfo owns the parsing Zone.

src/debug/debug-scopes.cc

 // Copyright 2015 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/debug/debug-scopes.h"
 
 #include <memory>
 
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
@@ skipping 68 matching lines @@
     if (scope_info->scope_type() == FUNCTION_SCOPE) {
       nested_scope_chain_.Add(ExtendedScopeInfo(scope_info,
                                                 shared_info->start_position(),
                                                 shared_info->end_position()));
     }
     if (!collect_non_locals) return;
   }
 
   // Reparse the code and analyze the scopes.
   // Check whether we are in global, eval or function code.
-  Zone zone(isolate->allocator(), ZONE_NAME);
   std::unique_ptr<ParseInfo> info;
   if (scope_info->scope_type() != FUNCTION_SCOPE) {
     // Global or eval code.
     Handle<Script> script(Script::cast(shared_info->script()));
-    info.reset(new ParseInfo(&zone, script));
+    info.reset(new ParseInfo(script));
     if (scope_info->scope_type() == EVAL_SCOPE) {
       info->set_eval();
       if (!function->context()->IsNativeContext()) {
         info->set_outer_scope_info(handle(function->context()->scope_info()));
       }
       // Language mode may be inherited from the eval caller.
       // Retrieve it from shared function info.
       info->set_language_mode(shared_info->language_mode());
     } else if (scope_info->scope_type() == MODULE_SCOPE) {
       info->set_module();
     } else {
       DCHECK(scope_info->scope_type() == SCRIPT_SCOPE);
     }
   } else {
     // Inner function.
-    info.reset(new ParseInfo(&zone, shared_info));
+    info.reset(new ParseInfo(shared_info));
   }
   if (parsing::ParseAny(info.get()) && Rewriter::Rewrite(info.get())) {
     DeclarationScope* scope = info->literal()->scope();
     if (!ignore_nested_scopes || collect_non_locals) {
       CollectNonLocals(info.get(), scope);
     }
     if (!ignore_nested_scopes) {
       DeclarationScope::Analyze(info.get(), AnalyzeMode::kDebugger);
       RetrieveScopeChain(scope);
     }
@@ skipping 735 matching lines @@
     DCHECK((beg_pos >= 0 && end_pos >= 0) || inner_scope->is_hidden());
     if (beg_pos <= position && position < end_pos) {
       GetNestedScopeChain(isolate, inner_scope, position);
       return;
     }
   }
 }
 
 }  // namespace internal
 }  // namespace v8