Regressions on trunk at revision 273321 vs revision 273261

[H.J. Lu (Intel64 AVX)]

New failures:
FAIL: gcc.dg/strlenopt-67.c (test for excess errors)
FAIL: gcc.dg/strlenopt-67.c (test for excess errors)
FAIL: gcc.dg/strlenopt-67.c (test for excess errors)

New passes:
FAIL: c-c++-common/pr44832.c  -std=gnu++14 (test for excess errors)
FAIL: c-c++-common/pr44832.c  -std=gnu++17 (test for excess errors)
FAIL: c-c++-common/pr44832.c  -std=gnu++98 (test for excess errors)
FAIL: c-c++-common/pr44832.c  -Wc++-compat  (test for excess errors)
FAIL: gcc.dg/pr46571.c (test for excess errors)