Regressions on trunk at revision 219700 vs revision 219691

[i64corei7avx512@ecsmtp.ims.intel.com]

New failures:
ERROR: (DejaGnu) proc "libatomic_target_compile lto18507.c lto18507.o object additional_flags=-flto" does not exist.

New passes:
ERROR: (DejaGnu) proc "libatomic_target_compile lto1063.c lto1063.o object additional_flags=-flto" does not exist.