Regressions on trunk at revision 240022 vs revision 240004

[H.J. Lu ia32 Core i7]

New failures:
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)

New passes: