ARM64: Use ARRAY_SIZE where possible.

BUG=
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/437813004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22816 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm64/assembler-arm64.cc

@@ -227,7 +227,7 @@ bool AreAliased(const CPURegister& reg1, const CPURegister& reg2,
 
   const CPURegister regs[] = {reg1, reg2, reg3, reg4, reg5, reg6, reg7, reg8};
 
-  for (unsigned i = 0; i < sizeof(regs) / sizeof(regs[0]); i++) {
+  for (unsigned i = 0; i < ARRAY_SIZE(regs); i++) {
     if (regs[i].IsRegister()) {
       number_of_valid_regs++;
       unique_regs |= regs[i].Bit();
@@ -2658,8 +2658,7 @@ bool Assembler::IsImmLogical(uint64_t value,
   int multiplier_idx = CountLeadingZeros(d, kXRegSizeInBits) - 57;
   // Ensure that the index to the multipliers array is within bounds.
   DCHECK((multiplier_idx >= 0) &&
-         (static_cast<size_t>(multiplier_idx) <
-          (sizeof(multipliers) / sizeof(multipliers[0]))));
+         (static_cast<size_t>(multiplier_idx) < ARRAY_SIZE(multipliers)));
   uint64_t multiplier = multipliers[multiplier_idx];
   uint64_t candidate = (b - a) * multiplier;
 

src/arm64/instrument-arm64.cc

@@ -107,8 +107,7 @@ Instrument::Instrument(const char* datafile, uint64_t sample_period)
     }
   }
 
-  static const int num_counters =
-    sizeof(kCounterList) / sizeof(CounterDescriptor);
+  static const int num_counters = ARRAY_SIZE(kCounterList);
 
   // Dump an instrumentation description comment at the top of the file.
   fprintf(output_stream_, "# counters=%d\n", num_counters);

src/arm64/simulator-arm64.cc

@@ -1065,7 +1065,7 @@ void Simulator::PrintSystemRegisters(bool print_all) {
       "0b10 (Round towards Minus Infinity)",
       "0b11 (Round towards Zero)"
     };
-    DCHECK(fpcr().RMode() <= (sizeof(rmode) / sizeof(rmode[0])));
+    DCHECK(fpcr().RMode() < ARRAY_SIZE(rmode));
     fprintf(stream_, "# %sFPCR: %sAHP:%d DN:%d FZ:%d RMode:%s%s\n",
             clr_flag_name,
             clr_flag_value,