Use fast_sqrt instead of std::sqrt in simulators.

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>
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/arm64/decoder-arm64-inl.h"
 #include "src/arm64/simulator-arm64.h"
 #include "src/assembler.h"
+#include "src/codegen.h"
 #include "src/disasm.h"
 #include "src/macro-assembler.h"
 #include "src/ostreams.h"
 
 namespace v8 {
 namespace internal {
 
 #if defined(USE_SIMULATOR)
 
 
@@ skipping 3068 matching lines @@
 }
 
 
 template <typename T>
 T Simulator::FPSqrt(T op) {
   if (std::isnan(op)) {
     return FPProcessNaN(op);
   } else if (op < 0.0) {
     return FPDefaultNaN<T>();
   } else {
-    return std::sqrt(op);
+    return fast_sqrt(op);
   }
 }
 
 
 template <typename T>
 T Simulator::FPSub(T op1, T op2) {
   // NaNs should be handled elsewhere.
   DCHECK(!std::isnan(op1) && !std::isnan(op2));
 
   if (std::isinf(op1) && std::isinf(op2) && (op1 == op2)) {
@@ skipping 716 matching lines @@
 
   delete[] format;
 }
 
 
 #endif  // USE_SIMULATOR
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64