[build] Use MSVS 2015 by default.

src/d8.cc

 // 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.
 
 
 // Defined when linking against shared lib on Windows.
 #if defined(USING_V8_SHARED) && !defined(V8_SHARED)
 #define V8_SHARED
 #endif
 
@@ skipping 1241 matching lines @@
             String::NewFromUtf8(isolate, "arguments", NewStringType::kNormal)
                 .ToLocalChecked(),
             Utils::ToLocal(arguments_jsarray))
       .FromJust();
 #endif  // !V8_SHARED
   return handle_scope.Escape(context);
 }
 
 
 void Shell::Exit(int exit_code) {
-  // Use _exit instead of exit to avoid races between isolate
-  // threads and static destructors.
   fflush(stdout);
   fflush(stderr);
-  _exit(exit_code);
+  exit(exit_code);
 }
 
 
 #ifndef V8_SHARED
 struct CounterAndKey {
   Counter* counter;
   const char* key;
 };
 
 
@@ skipping 1249 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif