Add a target to run the SyzyAsan RTL unittests in 4G

syzygy/agent/asan/shadow.h

 // Copyright 2012 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
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   size_t lower_index_;
   size_t upper_index_;
 
   // The shadow cursor.
   const uint8_t* shadow_cursor_;
 
   DISALLOW_COPY_AND_ASSIGN(ShadowWalker);
 };
 
 // The static shadow memory that is referred to by the memory interceptors.
-// These are provided by one of 'dummy_shadow.cc' or 'static_shadow.cc'.
 extern "C" {
-extern const size_t asan_memory_interceptors_shadow_memory_size;
 extern uint8_t asan_memory_interceptors_shadow_memory[];
 }
 
 // Bring in the implementation of the templated functions.
 #include "syzygy/agent/asan/shadow_impl.h"
 
 }  // namespace asan
 }  // namespace agent
 
 #endif  // SYZYGY_AGENT_ASAN_SHADOW_H_