gdb/dwarf: remove create_dwo_cu_reader

This function, as can be seen by its comment, is a remnant of past
design.  Inline its content into create_cus_hash_table.

Change-Id: Id900bae2cdce8f33bf01199fb1d366646effc76e
Approved-By: Tom Tromey <tom@tromey.com>
1 file changed