(A-BC-8D7C): New abstract character.

(BC-8D7C-var-002): New character; use `<-denotational' for A-BC-8D7C.
(BC-8D7C): Add `<-denotational' for A-BC-8D7C; delete `=>ucs' for
U+5BC0; use `<-formed@component' for U+5BC0.
(GT-K07616): Use `<-subsumptive' instead of `<-denotational' for
BC-8D7C.