Reland of land: [Parse] ParseInfo owns the parsing Zone.

src/parsing/parse-info.h

Index: src/parsing/parse-info.h
diff --git a/src/parsing/parse-info.h b/src/parsing/parse-info.h
index 02e413fd96dd8b537be5626adada7ee49c88d50d..b3f47692a19da613363e8220abf74c69903c33eb 100644
--- a/src/parsing/parse-info.h
+++ b/src/parsing/parse-info.h
@@ -4,6 +4,8 @@
 
 #ifndef V8_PARSING_PARSE_INFO_H_
 #define V8_PARSING_PARSE_INFO_H_
+
+#include <memory>
 
 #include "include/v8.h"
 #include "src/globals.h"
@@ -16,6 +18,7 @@
 
 namespace internal {
 
+class AccountingAllocator;
 class AstRawString;
 class AstValueFactory;
 class DeclarationScope;
@@ -29,13 +32,18 @@
 // A container for the inputs, configuration options, and outputs of parsing.
 class V8_EXPORT_PRIVATE ParseInfo {
  public:
-  explicit ParseInfo(Zone* zone);
-  ParseInfo(Zone* zone, Handle<Script> script);
-  ParseInfo(Zone* zone, Handle<SharedFunctionInfo> shared);
+  explicit ParseInfo(AccountingAllocator* zone_allocator);
+  ParseInfo(Handle<Script> script);
+  ParseInfo(Handle<SharedFunctionInfo> shared);
+
+  // TODO(rmcilroy): Remove once Hydrogen no longer needs this.
+  ParseInfo(Handle<SharedFunctionInfo> shared, std::shared_ptr<Zone> zone);
 
   ~ParseInfo();
 
-  Zone* zone() const { return zone_; }
+  Zone* zone() const { return zone_.get(); }
+
+  std::shared_ptr<Zone> zone_shared() const { return zone_; }
 
 // Convenience accessor methods for flags.
 #define FLAG_ACCESSOR(flag, getter, setter)     \
@@ -226,7 +234,7 @@
   };
 
   //------------- Inputs to parsing and scope analysis -----------------------
-  Zone* zone_;
+  std::shared_ptr<Zone> zone_;
   unsigned flags_;
   ScriptCompiler::ExternalSourceStream* source_stream_;
   ScriptCompiler::StreamedSource::Encoding source_stream_encoding_;