RFR(M): 8054478 C2: Incorrectly compiled char[] array access crashes JVM

[Roland Westrelin]

> loopTransform.cpp
> 
> insert_castii_before_loop() --> cast_incr_before_loop()
> You missed registration of new CastII nodes - register_new_node().

Actually I don’t understand why there’s a need for the register_new_node() call on the CastII nodes since I already _igvn.transform() them.

Roland.