core: Add nr_entries member to 'struct cus'

Will be used when considering comparing multiple CU entries in a struct
cus to the sole compile unit in a second file, like when comparing the
types in a multi-CU DWARF file like vmlinux against the combined,
deduplicated entries in that vmlinux .BTF section.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2 files changed