Reset code age on the cloned code when serializing.

src/serialize.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/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/platform/platform.h"
 #include "src/bootstrapper.h"
@@ skipping 1856 matching lines @@
 #undef RAW_CASE
     {  /* NOLINT */
       // We always end up here if we are outputting the code of a code object.
       sink_->Put(kRawData, "RawData");
       sink_->PutInt(bytes_to_output, "length");
     }
 
     // To make snapshots reproducible, we need to wipe out all pointers in code.
     if (code_object_) {
       Code* code = CloneCodeObject(object_);
+      // Code age headers are not serializable.
+      code->MakeYoung(serializer_->isolate());
       WipeOutRelocations(code);
       // We need to wipe out the header fields *after* wiping out the
       // relocations, because some of these fields are needed for the latter.
       code->WipeOutHeader();
       object_start = code->address();
     }
 
     const char* description = code_object_ ? "Code" : "Byte";
     sink_->PutRaw(object_start + base, bytes_to_output, description);
     if (code_object_) delete[] object_start;
@@ skipping 155 matching lines @@
         SerializeIC(code_object, how_to_code, where_to_point);
         return;
       case Code::FUNCTION:
         DCHECK(code_object->has_reloc_info_for_serialization());
         // Only serialize the code for the toplevel function unless specified
         // by flag. Replace code of inner functions by the lazy compile builtin.
         // This is safe, as checked in Compiler::BuildFunctionInfo.
         if (code_object != main_code_ && !FLAG_serialize_inner) {
           SerializeBuiltin(Builtins::kCompileLazy, how_to_code, where_to_point);
         } else {
-          code_object->MakeYoung();
           SerializeGeneric(code_object, how_to_code, where_to_point);
         }
         return;
     }
     UNREACHABLE();
   }
 
   // Past this point we should not see any (context-specific) maps anymore.
   CHECK(!obj->IsMap());
   // There should be no references to the global object embedded.
@@ skipping 257 matching lines @@
 bool SerializedCodeData::IsSane(String* source) {
   return GetHeaderValue(kCheckSumOffset) == CheckSum(source) &&
          PayloadLength() >= SharedFunctionInfo::kSize;
 }
 
 
 int SerializedCodeData::CheckSum(String* string) {
   return Version::Hash() ^ string->length();
 }
 } }  // namespace v8::internal