Remove custom win64 modulo code

src/codegen.h

 // Copyright 2012 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.
 
 #ifndef V8_CODEGEN_H_
 #define V8_CODEGEN_H_
 
 #include "src/code-stubs.h"
 #include "src/runtime/runtime.h"
 
@@ skipping 82 matching lines @@
 
 UnaryMathFunctionWithIsolate CreateExpFunction(Isolate* isolate);
 UnaryMathFunctionWithIsolate CreateSqrtFunction(Isolate* isolate);
 
 
 double modulo(double x, double y);
 
 // Custom implementation of math functions.
 double fast_exp(double input, Isolate* isolate);
 double fast_sqrt(double input, Isolate* isolate);
-#ifdef _WIN64
-void init_modulo_function();
-#endif
 void lazily_initialize_fast_exp(Isolate* isolate);
 void lazily_initialize_fast_sqrt(Isolate* isolate);
 
 
 class ElementsTransitionGenerator : public AllStatic {
  public:
   // If |mode| is set to DONT_TRACK_ALLOCATION_SITE,
   // |allocation_memento_found| may be NULL.
   static void GenerateMapChangeElementsTransition(
       MacroAssembler* masm,
@@ skipping 51 matching lines @@
 #ifdef V8_TARGET_ARCH_ARM64
   const EmbeddedVector<byte, kNoCodeAgeSequenceLength> old_sequence_;
 #endif
 #endif
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODEGEN_H_