[Bug lto/94311] LTO produces line info entries with invalid line numbers

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94311

--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
so

void
lto_location_cache::input_location_and_block (location_t *loc, tree *block,
                                    struct bitpack_d *bp,
                                    class lto_input_block *ib,
                                    class data_in *data_in);

and use that.  Should be able to drop stream_input_location_now completely
then.  In apply location cache then handle the case of NULL and non-NULL
block pointers, I think we can mix those freely.