https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78575
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> --- I think MEMs just shouldn't be shared, and at least in quick skimming I haven't found anything the the DEBUG_INSNs that would look invalid. What I think is wrong is that DECL_INCOMING_RTL and DECL_RTL of the PARM_DECL is changed, I think var-tracking uses those.
