[crankshaft] Move CompilationPhase into separate file.

src/crankshaft/hydrogen.h

 // 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.
 
 #ifndef V8_CRANKSHAFT_HYDROGEN_H_
 #define V8_CRANKSHAFT_HYDROGEN_H_
 
 #include "src/accessors.h"
 #include "src/allocation.h"
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/bailout-reason.h"
 #include "src/compiler.h"
+#include "src/crankshaft/compilation-phase.h"
 #include "src/crankshaft/hydrogen-instructions.h"
 #include "src/zone.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class BitVector;
 class FunctionState;
 class HEnvironment;
@@ skipping 2998 matching lines @@
 
  private:
   HGraphBuilder* builder_;
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_HYDROGEN_H_