[crankshaft] Move CompilationPhase into separate file.

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index cc96dd9adb1191585ea68cfb8425289987121c24..0615e43ab5b89f8a48085a6bd1d2f4cbadc3a238 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -664,30 +664,6 @@ class Compiler : public AllStatic {
       OptimizedCompileJob* job);
 };
 
-
-class CompilationPhase BASE_EMBEDDED {
- public:
-  CompilationPhase(const char* name, CompilationInfo* info);
-  ~CompilationPhase();
-
- protected:
-  bool ShouldProduceTraceOutput() const;
-
-  const char* name() const { return name_; }
-  CompilationInfo* info() const { return info_; }
-  Isolate* isolate() const { return info()->isolate(); }
-  Zone* zone() { return &zone_; }
-
- private:
-  const char* name_;
-  CompilationInfo* info_;
-  Zone zone_;
-  size_t info_zone_start_allocation_size_;
-  base::ElapsedTimer timer_;
-
-  DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
-};
-
 }  // namespace internal
 }  // namespace v8