Add compile timestamp to Code

runtime/vm/raw_object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 #include "vm/token.h"
@@ skipping 816 matching lines @@
   RawArray* deopt_info_array_;
   RawArray* object_table_;
   RawArray* static_calls_target_table_;  // (code-offset, function, code).
   RawArray* stackmaps_;
   RawLocalVarDescriptors* var_descriptors_;
   RawArray* comments_;
   RawObject** to() {
     return reinterpret_cast<RawObject**>(&ptr()->comments_);
   }
 
+  // Compilation timestamp.
+  int64_t compile_timestamp_;
   intptr_t pointer_offsets_length_;
   // Alive: If true, the embedded object pointers will be visited during GC.
   // This field cannot be shorter because of alignment issues on x64
   // architectures.
   intptr_t state_bits_;  // state, is_optimized, is_alive.
 
   // Variable length data follows here.
   int32_t data_[0];
 
   friend class StackFrame;
@@ skipping 928 matching lines @@
   // Make sure this is updated when new TypedData types are added.
   ASSERT(kTypedDataInt8ArrayViewCid == kTypedDataInt8ArrayCid + 14);
   ASSERT(kExternalTypedDataInt8ArrayCid == kTypedDataInt8ArrayViewCid + 15);
   ASSERT(kNullCid == kExternalTypedDataInt8ArrayCid + 14);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_