Refactor register allocator a little bit

src/lithium-allocator-inl.h

 // Copyright 2011 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 127 matching lines @@
 }
 
 
 void UseIterator::Advance() {
   input_iterator_.Done()
       ? env_iterator_.Advance()
       : input_iterator_.Advance();
 }
 
 
-void LAllocator::SetLiveRangeAssignedRegister(
-    LiveRange* range,
-    int reg,
-    RegisterKind register_kind) {
-  if (register_kind == DOUBLE_REGISTERS) {
+void LAllocator::SetLiveRangeAssignedRegister(LiveRange* range, int reg) {
+  if (range->Kind() == DOUBLE_REGISTERS) {
     assigned_double_registers_->Add(reg);
   } else {
+    ASSERT(range->Kind() == GENERAL_REGISTERS);
     assigned_registers_->Add(reg);
   }
-  range->set_assigned_register(reg, register_kind, chunk()->zone());
+  range->set_assigned_register(reg, chunk()->zone());
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LITHIUM_ALLOCATOR_INL_H_