Regressions on trunk at revision 244388 vs revision 244372

[Intel Automatic Testing System [ia32 Core AVX2]]

New failures:
FAIL: gcc.dg/attr-alloc_size-4.c (test for excess errors)

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++14 (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)