Revert of Remove register index/code indirection

src/ia32/lithium-gap-resolver-ia32.h

 // Copyright 2011 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_IA32_LITHIUM_GAP_RESOLVER_IA32_H_
 #define V8_IA32_LITHIUM_GAP_RESOLVER_IA32_H_
 
 #include "src/lithium.h"
 
 namespace v8 {
@@ skipping 54 matching lines @@
 
   // Verify the move list before performing moves.
   void Verify();
 
   LCodeGen* cgen_;
 
   // List of moves not yet resolved.
   ZoneList<LMoveOperands> moves_;
 
   // Source and destination use counts for the general purpose registers.
-  int source_uses_[Register::kNumRegisters];
-  int destination_uses_[DoubleRegister::kMaxNumRegisters];
+  int source_uses_[Register::kMaxNumAllocatableRegisters];
+  int destination_uses_[Register::kMaxNumAllocatableRegisters];
 
   // If we had to spill on demand, the currently spilled register's
   // allocation index.
   int spilled_register_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_LITHIUM_GAP_RESOLVER_IA32_H_