[crankshaft] Move CompilationPhase into separate file.

src/crankshaft/lithium.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_LITHIUM_H_
 #define V8_CRANKSHAFT_LITHIUM_H_
 
 #include <set>
 
 #include "src/allocation.h"
 #include "src/bailout-reason.h"
+#include "src/crankshaft/compilation-phase.h"
 #include "src/crankshaft/hydrogen.h"
 #include "src/safepoint-table.h"
 #include "src/zone-allocator.h"
 
 namespace v8 {
 namespace internal {
 
 #define LITHIUM_OPERAND_LIST(V)               \
   V(ConstantOperand, CONSTANT_OPERAND,  128)  \
   V(StackSlot,       STACK_SLOT,        128)  \
@@ skipping 814 matching lines @@
   InputIterator input_iterator_;
   DeepIterator env_iterator_;
 };
 
 class LInstruction;
 class LCodeGen;
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_LITHIUM_H_