java/interp: Fix putfield and getfield class init
java/interp: Fix putfield and getfield class init

We need to initialize the class of the objectref, not the class where
the field was defined in because it can be in a superclass.

Signed-off-by: Pekka Enberg <add4fcd06328a394f0ad91feda7ee057316dc5ed@iki.fi>

penberg/hornet,penberg/hornet,penberg/hornet,penberg/hornet