7079713: javac hangs when compiling a class that references a cyclically inherited class Summary: Types.membersClosure needs to handle pathological cases of cyclic inheritance Reviewed-by: jjg, jjh

7085024: internal error; cannot instantiate Foo Summary: Types.isConvertible does not handle erroneous types correctly Reviewed-by: jjg

Added tag jdk8-b05 for changeset deef5f066e00

Merge