Refactor lithium operand declaration a little bit.

src/lithium-allocator.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 33 matching lines @@
 class HPhi;
 class HTracer;
 class HValue;
 class BitVector;
 class StringStream;
 
 class LArgument;
 class LPlatformChunk;
 class LOperand;
 class LUnallocated;
-class LConstantOperand;
 class LGap;
 class LParallelMove;
 class LPointerMap;
-class LStackSlot;
-class LRegister;
 
 
 // This class represents a single point of a LOperand's lifetime.
 // For each lithium instruction there are exactly two lifetime positions:
 // the beginning and the end of the instruction. Lifetime positions for
 // different lithium instructions are disjoint.
 class LifetimePosition {
  public:
   // Return the lifetime position that corresponds to the beginning of
   // the instruction with the given index.
@@ skipping 582 matching lines @@
   LAllocator* allocator_;
   unsigned allocator_zone_start_allocation_size_;
 
   DISALLOW_COPY_AND_ASSIGN(LAllocatorPhase);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LITHIUM_ALLOCATOR_H_