Workaround of realloc in node_buffer

Fix nwjs/nw.js#4357

Author: rogerwang

src/node_buffer.cc

@@ -243,12 +243,18 @@ MaybeLocal<Object> New(Isolate* isolate,
     CHECK(actual <= length);
 
     if (actual == 0) {
-      free(data);
+      isolate->array_buffer_allocator()->Free(data, length);
       data = nullptr;
-    } else if (actual < length) {
+    }
+#if 0 //FIXME #4357: costs some extra bytes here. It shouldn't be
+      //significant because of the length calculation in
+      //StringBytes::Size()
+      //v8 buffer allocator doesn't support reallocate
+    else if (actual < length) {
       data = static_cast<char*>(realloc(data, actual));
       CHECK_NE(data, nullptr);
     }
+#endif
   }
 
   Local<Object> buf;