[arm][arm64] Improve CountTrailingZero implementation.

src/arm64/simulator-arm64.cc

 // Copyright 2013 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.
 
 #include <stdlib.h>
 #include <cmath>
 #include <cstdarg>
 
 #if V8_TARGET_ARCH_ARM64
 
@@ skipping 1978 matching lines @@
   }
 }
 
 
 void Simulator::VisitDataProcessing1Source(Instruction* instr) {
   unsigned dst = instr->Rd();
   unsigned src = instr->Rn();
 
   switch (instr->Mask(DataProcessing1SourceMask)) {
     case RBIT_w:
-      set_wreg(dst, ReverseBits(wreg(src)));
+      set_wreg(dst, base::bits::ReverseBits(wreg(src)));
       break;
     case RBIT_x:
-      set_xreg(dst, ReverseBits(xreg(src)));
+      set_xreg(dst, base::bits::ReverseBits(xreg(src)));
       break;
     case REV16_w:
       set_wreg(dst, ReverseBytes(wreg(src), 1));
       break;
     case REV16_x:
       set_xreg(dst, ReverseBytes(xreg(src), 1));
       break;
     case REV_w:
       set_wreg(dst, ReverseBytes(wreg(src), 2));
       break;
@@ skipping 1855 matching lines @@
   delete[] format;
 }
 
 
 #endif  // USE_SIMULATOR
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64