Get rid of the last few uses of typeidTypeName() rather than

src/backend/catalog/pg_aggregate.c

src/backend/catalog/pg_proc.c

src/backend/commands/tablecmds.c

src/backend/executor/nodeAgg.c

src/backend/executor/nodeGroup.c

src/backend/optimizer/plan/initsplan.c

src/backend/parser/parse_coerce.c

src/backend/parser/parse_expr.c

src/backend/parser/parse_func.c

src/backend/parser/parse_type.c

src/include/parser/parse_type.h

src/test/regress/expected/errors.out

src/test/regress/expected/privileges.out