https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94303
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Jonathan has bisected this to my r9-4877-gfaa9232da39587b27b46341667d6d415d2af9280 change (though, as the patch shows, the bug is actually that varasm.c didn't handle RANGE_EXPRs properly during output_constructor.