[13] RFR(T) 8223531: [Graal] assert(type() == T_INT) failed: type check

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/8223531/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8223531

In my JDK13 port of JVMCI changes (8220623) pushed recently I missed few lines from GR-13374 changes 
in graal-jmvci-8.

Doug Simon found that and prepared this fix.

Thanks,
Vladimir