[crankshaft] Move CompilationPhase into separate file.

src/compiler.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_COMPILER_H_
 #define V8_COMPILER_H_
 
 #include "src/allocation.h"
 #include "src/ast/ast.h"
 #include "src/bailout-reason.h"
@@ skipping 646 matching lines @@
       Handle<JSFunction> function, ConcurrencyMode mode,
       BailoutId osr_ast_id = BailoutId::None(),
       JavaScriptFrame* osr_frame = nullptr);
 
   // Generate and return code from previously queued optimization job.
   // On failure, return the empty handle.
   MUST_USE_RESULT static MaybeHandle<Code> GetConcurrentlyOptimizedCode(
       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
 
 #endif  // V8_COMPILER_H_