Bytecode testing needs updating to correctly emit Q type descriptors with the return to L/Q<type> descriptors (result of "lqagain" work)

Affected instructions when given "<type>.val.class":
* anewarray
* checkcast
* instanceof
* ldc

Test library in it's current form doesn't support "ldc(Class<?>)", and since the verification of the produced bytecode is pretty messy for a test library on still prototype JVMS changes, manual inspection can suffice for now