https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126347
--- Comment #3 from Drea Pinski <pinskia at gcc dot gnu.org> --- See https://gcc.gnu.org/wiki/A_guide_to_testcase_reduction#Using_C-Vise_and_C-Reduce for some help with reduction of a LTO ICE. That is start with figuring out what is the smallest number of .o files to reproduce the failure. And then once you found that reducing each .ii/.i file for the ICE. You can also use some --param to change how partitioning happens which might help here too.
