Reland: [Parse] ParseInfo owns the parsing Zone.

test/unittests/compiler-dispatcher/optimizing-compile-dispatcher-unittest.cc

 // Copyright 2017 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/compiler-dispatcher/optimizing-compile-dispatcher.h"
 
 #include "src/base/atomic-utils.h"
 #include "src/base/platform/semaphore.h"
 #include "src/compilation-info.h"
 #include "src/compiler.h"
 #include "src/handles.h"
 #include "src/isolate.h"
 #include "src/objects-inl.h"
 #include "src/parsing/parse-info.h"
-#include "src/zone/zone.h"
 #include "test/unittests/compiler-dispatcher/compiler-dispatcher-helper.h"
 #include "test/unittests/test-utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace v8 {
 namespace internal {
 
 typedef TestWithContext OptimizingCompileDispatcherTest;
 
 namespace {
 
 class BlockingCompilationJob : public CompilationJob {
  public:
   BlockingCompilationJob(Isolate* isolate, Handle<JSFunction> function)
       : CompilationJob(isolate, &info_, "BlockingCompilationJob",
                        State::kReadyToExecute),
-        zone_(isolate->allocator(), ZONE_NAME),
-        parse_info_(&zone_, handle(function->shared())),
+        parse_info_(handle(function->shared())),
         info_(&parse_info_, function),
         blocking_(false),
         semaphore_(0) {}
   ~BlockingCompilationJob() override = default;
 
   bool IsBlocking() const { return blocking_.Value(); }
   void Signal() { semaphore_.Signal(); }
 
   // CompilationJob implementation.
   Status PrepareJobImpl() override {
     UNREACHABLE();
     return FAILED;
   }
 
   Status ExecuteJobImpl() override {
     blocking_.SetValue(true);
     semaphore_.Wait();
     blocking_.SetValue(false);
     return SUCCEEDED;
   }
 
   Status FinalizeJobImpl() override { return SUCCEEDED; }
 
  private:
-  Zone zone_;
   ParseInfo parse_info_;
   CompilationInfo info_;
   base::AtomicValue<bool> blocking_;
   base::Semaphore semaphore_;
 
   DISALLOW_COPY_AND_ASSIGN(BlockingCompilationJob);
 };
 
 }  // namespace
 
@@ skipping 20 matching lines @@
   // Should not block.
   dispatcher.Flush(OptimizingCompileDispatcher::BlockingBehavior::kDontBlock);
 
   // Unblock the job & finish.
   job->Signal();
   dispatcher.Stop();
 }
 
 }  // namespace internal
 }  // namespace v8