Regressions on trunk at revision 246473 vs revision 246436

[H.J. Lu]

New failures:

New passes:
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++11 (test for excess errors)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++11 (test for excess errors)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++11  (test for warnings, line 24)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++11  (test for warnings, line 24)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++11  (test for warnings, line 34)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++11  (test for warnings, line 34)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++14 (test for excess errors)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++14 (test for excess errors)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++14  (test for warnings, line 24)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++14  (test for warnings, line 24)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++14  (test for warnings, line 34)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++14  (test for warnings, line 34)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++98 (test for excess errors)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++98 (test for excess errors)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++98  (test for warnings, line 24)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++98  (test for warnings, line 24)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++98  (test for warnings, line 34)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -std=gnu++98  (test for warnings, line 34)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -Wc++-compat  (test for excess errors)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -Wc++-compat  (test for excess errors)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -Wc++-compat   (test for warnings, line 23)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -Wc++-compat   (test for warnings, line 23)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -Wc++-compat   (test for warnings, line 33)
FAIL: c-c++-common/Wimplicit-fallthrough-7.c  -Wc++-compat   (test for warnings, line 33)
FAIL: gcc.dg/Walloca-1.c (test for excess errors)
FAIL: gcc.dg/Walloca-1.c  (test for warnings, line 26)
FAIL: gcc.dg/Walloca-2.c note (test for warnings, line 38)
FAIL: gcc.dg/Walloca-2.c (test for excess errors)
FAIL: gcc.dg/Walloca-2.c  (test for warnings, line 38)
FAIL: gcc.dg/Wvla-larger-than-2.c note (test for warnings, line 25)
FAIL: gcc.dg/Wvla-larger-than-2.c note (test for warnings, line 25)