Fix warnings on Win64.

src/allocation.cc

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 62 matching lines @@
 
 
 void AllStatic::operator delete(void* p) {
   UNREACHABLE();
 }
 
 #endif
 
 
 char* StrDup(const char* str) {
-  int length = strlen(str);
+  int length = StrLength(str);
   char* result = NewArray<char>(length + 1);
   memcpy(result, str, length * kCharSize);
   result[length] = '\0';
   return result;
 }
 
 
-char* StrNDup(const char* str, size_t n) {
-  size_t length = strlen(str);
+char* StrNDup(const char* str, int n) {
+  int length = StrLength(str);
   if (n < length) length = n;
   char* result = NewArray<char>(length + 1);
   memcpy(result, str, length * kCharSize);
   result[length] = '\0';
   return result;
 }
 
 
 int NativeAllocationChecker::allocation_disallowed_ = 0;
 
@@ skipping 86 matching lines @@
   previous_->next_ = next_;
 }
 
 
 PreallocatedStorage::PreallocatedStorage(size_t size)
   : size_(size) {
   previous_ = next_ = this;
 }
 
 } }  // namespace v8::internal