construct fields in the right order (closes #15517)

Patch from Taihyun Hwang.
diff --git a/Misc/ACKS b/Misc/ACKS
index 465b5c2..b255ed2 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -476,6 +476,7 @@
 Jim Hugunin
 Greg Humphreys
 Eric Huss
+Taihyun Hwang
 Jeremy Hylton
 Gerhard Häring
 Fredrik Håård
@@ -1174,4 +1175,3 @@
 Kai Zhu
 Tarek Ziadé
 Peter Åstrand
-