Separate CompilationInfo into its own file.

src/crankshaft/compilation-phase.h

 // Copyright 2016 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_COMPILATION_PHASE_H_
 #define V8_CRANKSHAFT_COMPILATION_PHASE_H_
 
 #include "src/allocation.h"
-#include "src/compiler.h"
+#include "src/base/platform/elapsed-timer.h"
+#include "src/compilation-info.h"
 #include "src/zone.h"
 
 namespace v8 {
 namespace internal {
 
 class CompilationPhase BASE_EMBEDDED {
  public:
   CompilationPhase(const char* name, CompilationInfo* info);
   ~CompilationPhase();
 
@@ skipping 12 matching lines @@
   size_t info_zone_start_allocation_size_;
   base::ElapsedTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_COMPILATION_PHASE_H_