Don't write Code::code_source_map_ in snapshots.

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/atomic.h"
 #include "vm/globals.h"
@@ skipping 1117 matching lines @@
   }
   RawInstructions* active_instructions_;
   RawInstructions* instructions_;
   RawObjectPool* object_pool_;
   // If owner_ is Function::null() the owner is a regular stub.
   // If owner_ is a Class the owner is the allocation stub for that class.
   // Else, owner_ is a regular Dart Function.
   RawObject* owner_;  // Function, Null, or a Class.
   RawExceptionHandlers* exception_handlers_;
   RawPcDescriptors* pc_descriptors_;
-  RawCodeSourceMap* code_source_map_;
   RawArray* stackmaps_;
-  RawObject** to_snapshot() {
-    return reinterpret_cast<RawObject**>(&ptr()->stackmaps_);
-  }
   RawArray* deopt_info_array_;
   RawArray* static_calls_target_table_;  // (code-offset, function, code).
   RawLocalVarDescriptors* var_descriptors_;
   RawArray* inlined_metadata_;
+  RawCodeSourceMap* code_source_map_;
   RawArray* comments_;
   // If return_address_metadata_ is a Smi, it is the offset to the prologue.
   // Else, return_address_metadata_ is null.
   RawObject* return_address_metadata_;
   RawObject** to() {
     return reinterpret_cast<RawObject**>(&ptr()->return_address_metadata_);
   }
 
   // Compilation timestamp.
   int64_t compile_timestamp_;
@@ skipping 1283 matching lines @@
   COMPILE_ASSERT(kExternalTypedDataInt8ArrayCid ==
                  kTypedDataInt8ArrayViewCid + 15);
   COMPILE_ASSERT(kByteBufferCid == kExternalTypedDataInt8ArrayCid + 14);
   COMPILE_ASSERT(kNullCid == kByteBufferCid + 1);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_