VM: Support bootstrapping core libraries from Kernel binaries instead of source.

runtime/vm/kernel.h

 // Copyright (c) 2016, 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 RUNTIME_VM_KERNEL_H_
 #define RUNTIME_VM_KERNEL_H_
 
+#if !defined(DART_PRECOMPILED_RUNTIME)
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/globals.h"
 
+
 #define KERNEL_NODES_DO(M)                                                     \
   M(Name)                                                                      \
   M(InferredValue)                                                             \
   M(DartType)                                                                  \
   M(InvalidType)                                                               \
   M(DynamicType)                                                               \
   M(VoidType)                                                                  \
   M(InterfaceType)                                                             \
   M(FunctionType)                                                              \
   M(TypeParameterType)
@@ skipping 3214 matching lines @@
 
   virtual void WriteBytes(uint8_t* buffer, int count) = 0;
 };
 
 
 void WritePrecompiledKernel(ByteWriter* out, kernel::Program* program);
 
 
 }  // namespace dart
 
+#endif  // !defined(DART_PRECOMPILED_RUNTIME)
 #endif  // RUNTIME_VM_KERNEL_H_