core: Print more info on tag__assert_search_result()

Its about showing the tag for which we're not finding its type, so we
want to know if it is a class member, a function argument, etc:

Before:

⬢[acme@toolbox pahole]$ pahole --compile eelco/ovs-vswitchd_rhel8 > a
/var/home/acme/git/pahole/dwarves_emit.c::typedef__emit_definitions(158): tag not found, please report to acme@kernel.org

After:

⬢[acme@toolbox pahole]$ pahole --compile eelco/ovs-vswitchd_rhel8 > a
/var/home/acme/git/pahole/dwarves_emit.c::typedef__emit_definitions(158, related to the type of tag DW_TAG_typedef "_IO_lock_t"): tag not found, please report to acme@kernel.org

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