X_db_search_symbol(). Otherwise we don't see important symbols in
non-verbosely written assembler code.
NetBSD already has this. The kld version already has a stronger form
of it without really trying -- linker_ddb_search_symbol() doesn't
support ddb's symbol search strategy parameter, so the kld
X_db_search_symbol() doesn't pass the parameter to linker_ddb...() and
linker_ddb...() doesn't make distinctions based on the symbol type.
db_elf.c now works better than db_kld.c when it works (which is essentially
when there are no modules except the kernel). It works after booting
with -d. db_kld.c doesn't work until lots of SYSINIT()s have run.
0e886780a8