I get this with +CompileTheWorld:

# Internal Error (/home/roland/valhalla/hotspot/src/share/vm/opto/valuetypenode.cpp:126), pid=1338, tid=1410
# assert(t->value_klass() == phase->C->env()->___Value_klass()) failed: unexpected value type klass

when:
CompileTheWorld (18364) : java/lang/__Value

which can be reproduced with:

java -XX:+CompileTheWorld -XX:CompileTheWorldStartAt=18364 -XX:CompileTheWorldStopAt=18365 -version