Change the register allocator so that it no longer tracks references...

src/ia32/assembler-ia32.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 61 matching lines @@
   }
   int bit() const  {
     ASSERT(is_valid());
     return 1 << code_;
   }
 
   // (unfortunately we can't make this private in a struct)
   int code_;
 };
 
-const int kNumRegisters = 8;
-
 extern Register eax;
 extern Register ecx;
 extern Register edx;
 extern Register ebx;
 extern Register esp;
 extern Register ebp;
 extern Register esi;
 extern Register edi;
 extern Register no_reg;
 
@@ skipping 763 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_ASSEMBLER_IA32_H_