Merge "Dexopt: fix a bug due to unsign int." am: 2d95bb9dc4 am: d9be9588ae am: d40888363b

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1500650

Change-Id: Icaef44fc96680213a4c13eda984a033842743f7b