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

src/arm/macro-assembler-arm.h

Index: src/arm/macro-assembler-arm.h
diff --git a/src/arm/macro-assembler-arm.h b/src/arm/macro-assembler-arm.h
index 86ae8f22d958e993259bc2cd25bbf006fd8f7394..f9f672bac6d084bbbad8fc6d6ea2a1cd3385f569 100644
--- a/src/arm/macro-assembler-arm.h
+++ b/src/arm/macro-assembler-arm.h
@@ -993,15 +993,6 @@ class MacroAssembler: public Assembler {
                    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);