Enable TurboFan for Win64 targets.

src/globals.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_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 15 matching lines @@
 # define V8_INFINITY INFINITY
 #endif
 
 #if V8_TARGET_ARCH_IA32 || (V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_32_BIT) || \
     V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_ARM64 || V8_TARGET_ARCH_MIPS ||     \
     V8_TARGET_ARCH_MIPS64
 #define V8_TURBOFAN_BACKEND 1
 #else
 #define V8_TURBOFAN_BACKEND 0
 #endif
-#if V8_TURBOFAN_BACKEND && !(V8_OS_WIN && V8_TARGET_ARCH_X64)
+#if V8_TURBOFAN_BACKEND
 #define V8_TURBOFAN_TARGET 1
 #else
 #define V8_TURBOFAN_TARGET 0
 #endif
 
 namespace v8 {
 
 namespace base {
 class Mutex;
 class RecursiveMutex;
@@ skipping 773 matching lines @@
   DCHECK(IsValidFunctionKind(kind));
   return kind & FunctionKind::kDefaultConstructor;
 }
 
 
 } }  // namespace v8::internal
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_