ipa-modref: Fix dumping

ipa-modref: Fix dumping

Function dump_lto_records ought to dump to its parameter OUT but was
dumping expressions to dump_file.  This is corrected by this patch and
while at at, I also made the modref_summary::dump member function
const so that it is callable from more contexts.

gcc/ChangeLog:

2023-09-21  Martin Jambor  <mjambor@suse.cz>

	* ipa-modref.h (modref_summary::dump): Make const.
	* ipa-modref.cc (modref_summary::dump): Likewise.
	(dump_lto_records): Dump to out instead of dump_file.