Running the following test provided by Sergey with -XX:ValueArrayElemMaxFlatSize=0 -Xint fails:
http://cr.openjdk.java.net/~skuksenko/valhalla/8229443/src/main/java/org/openjdk/err/

The test passes fine with array flattening or when removing the "inline" from Val6.java.

I found this when investigating JDK-8229443.