* class.c (common_enclosing_context_p): New function.
* java-tree.h (common_enclosing_context_p): Added prototype.
* parse.h (INNER_ENCLOSING_SCOPE_CHECK): Relaxed test to allow
classes sharing an outer context with the current instance.
* parse.y (build_access_to_thisn): Fixed leading comment.
(verify_constructor_super): New local `supper_inner'. Skip
enclosing context argument in the case of inner class constructors.
(patch_method_invocation): Insert proper context as second
parameter to pure inner class constructor super invocations.