Lazily initialize fast_sqrt() and pass an Isolate parameter to it

src/arm64/codegen-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 "src/arm64/codegen-arm64.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/arm64/simulator-arm64.h"
 #include "src/codegen.h"
@@ skipping 57 matching lines @@
 
 #if !defined(USE_SIMULATOR)
   return FUNCTION_CAST<UnaryMathFunctionWithIsolate>(buffer);
 #else
   fast_exp_arm64_machine_code = buffer;
   return &fast_exp_simulator;
 #endif
 }
 
 
-UnaryMathFunction CreateSqrtFunction() {
-  return &std::sqrt;
+UnaryMathFunctionWithIsolate CreateSqrtFunction(Isolate* isolate) {
+  return nullptr;
 }
 
 
 // -------------------------------------------------------------------------
 // Platform-specific RuntimeCallHelper functions.
 
 void StubRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const {
   masm->EnterFrame(StackFrame::INTERNAL);
   DCHECK(!masm->has_frame());
   masm->set_has_frame(true);
@@ skipping 540 matching lines @@
 
   __ Bind(&done);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64