Regressions on trunk at revision 244378 vs revision 244371

[H.J. Lu Intel64 Core i7]

New failures:

New passes:
FAIL: c-c++-common/Waddress-2.c  -std=gnu++11 (test for excess errors)
FAIL: c-c++-common/Waddress-2.c  -std=gnu++11 (test for excess errors)
FAIL: c-c++-common/Waddress-2.c  -std=gnu++14 (test for excess errors)
FAIL: c-c++-common/Waddress-2.c  -std=gnu++14 (test for excess errors)
FAIL: c-c++-common/Waddress-2.c  -std=gnu++98 (test for excess errors)
FAIL: c-c++-common/Waddress-2.c  -std=gnu++98 (test for excess errors)
FAIL: gcc.dg/pr78973.c  (test for warnings, line 12)