Replace the memcpy macro with a lint check.

runtime/vm/os_win.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "vm/os.h"
 #include "vm/vtune.h"
 
@@ skipping 178 matching lines @@
     return NULL;
   }
   if (n < len) {
     len = n;
   }
   char* result = reinterpret_cast<char*>(malloc(len + 1));
   if (result == NULL) {
     return NULL;
   }
   result[len] = '\0';
-  return reinterpret_cast<char*>(memcpy(result, s, len));
+  return reinterpret_cast<char*>(memmove(result, s, len));
 }
 
 
 void OS::Print(const char* format, ...) {
   va_list args;
   va_start(args, format);
   VFPrint(stdout, format, args);
   va_end(args);
 }
 
@@ skipping 101 matching lines @@
 }
 
 
 void OS::Exit(int code) {
   exit(code);
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)