Regressions on trunk at revision 240027 vs revision 240023

[Intel Automatic Testing System [ia32 Core AVX2]]

New failures:

New passes:
FAIL: c-c++-common/vector-subscript-8.c  -std=c++11 (test for excess errors)
FAIL: c-c++-common/vector-subscript-8.c  -std=c++14 (test for excess errors)
FAIL: c-c++-common/vector-subscript-8.c  -std=c++98 (test for excess errors)