ARM: clean up code now that ARMv6 is the baseline.

src/arm/macro-assembler-arm.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 975 matching lines @@
   // Performs a truncating conversion of a floating point number as used by
   // the JS bitwise operations. See ECMA-262 9.5: ToInt32.
   // Exits with 'result' holding the answer and all other registers clobbered.
   void ECMAToInt32(Register result,
                    DwVfpRegister double_input,
                    DwVfpRegister double_scratch,
                    Register scratch,
                    Register input_high,
                    Register input_low);
 
-  // Count leading zeros in a 32 bit word.  On ARM5 and later it uses the clz
-  // instruction.  On pre-ARM5 hardware this routine gives the wrong answer
-  // for 0 (31 instead of 32).  Source and scratch can be the same in which case
-  // the source is clobbered.  Source and zeros can also be the same in which
-  // case scratch should be a different register.
-  void CountLeadingZeros(Register zeros,
-                         Register source,
-                         Register scratch);
-
   // Check whether d16-d31 are available on the CPU. The result is given by the
   // Z condition flag: Z==0 if d16-d31 available, Z==1 otherwise.
   void CheckFor32DRegs(Register scratch);
 
 
   // ---------------------------------------------------------------------------
   // Runtime calls
 
   // Call a code stub.
   void CallStub(CodeStub* stub,
@@ skipping 435 matching lines @@
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_MACRO_ASSEMBLER_ARM_H_