[Parser] Introduce AstStringConstants to share constants across AstValueFactory

src/isolate.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/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
 
+#include "src/ast/ast-value-factory.h"
 #include "src/ast/context-slot-cache.h"
 #include "src/base/hashmap.h"
 #include "src/base/platform/platform.h"
 #include "src/base/sys-info.h"
 #include "src/base/utils/random-number-generator.h"
 #include "src/basic-block-profiler.h"
 #include "src/bootstrapper.h"
 #include "src/cancelable-task.h"
 #include "src/codegen.h"
 #include "src/compilation-cache.h"
@@ skipping 2346 matching lines @@
   compiler_dispatcher_ = nullptr;
 
   cancelable_task_manager()->CancelAndWait();
 
   heap_.TearDown();
   logger_->TearDown();
 
   delete interpreter_;
   interpreter_ = NULL;
 
+  delete ast_string_constants_;
+  ast_string_constants_ = nullptr;
+
   delete cpu_profiler_;
   cpu_profiler_ = NULL;
 
   code_event_dispatcher_.reset();
 
   delete root_index_map_;
   root_index_map_ = NULL;
 
   ClearSerializerData();
 }
@@ skipping 303 matching lines @@
            Internals::kIsolateEmbedderDataOffset);
   CHECK_EQ(static_cast<int>(OFFSET_OF(Isolate, heap_.roots_)),
            Internals::kIsolateRootsOffset);
   CHECK_EQ(static_cast<int>(OFFSET_OF(Isolate, heap_.external_memory_)),
            Internals::kExternalMemoryOffset);
   CHECK_EQ(static_cast<int>(OFFSET_OF(Isolate, heap_.external_memory_limit_)),
            Internals::kExternalMemoryLimitOffset);
 
   time_millis_at_init_ = heap_.MonotonicallyIncreasingTimeInMs();
 
+  {
+    HandleScope scope(this);
+    ast_string_constants_ = new AstStringConstants(this, heap()->HashSeed());
+  }
+
   if (!create_heap_objects) {
     // Now that the heap is consistent, it's OK to generate the code for the
     // deopt entry table that might have been referred to by optimized code in
     // the snapshot.
     HandleScope scope(this);
     Deoptimizer::EnsureCodeForDeoptimizationEntry(
         this, Deoptimizer::LAZY,
         ExternalReferenceTable::kDeoptTableSerializeEntryCount - 1);
   }
 
@@ skipping 940 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8