Regressions on trunk at revision 237826 vs revision 237817

[Intel Automatic Testing System [Intel64 Core AVXi]]

New failures:
FAIL: gcc.dg/atomic/c11-atomic-exec-4.c   -O3 -g  execution test
FAIL: gcc.dg/atomic/c11-atomic-exec-5.c   -O2  execution test
FAIL: gcc.dg/atomic/c11-atomic-exec-5.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  execution test
FAIL: gcc.dg/atomic/c11-atomic-exec-5.c   -O3 -g  execution test
WARNING: program timed out.
WARNING: program timed out.
WARNING: program timed out.
WARNING: program timed out.

New passes: