Regressions on trunk at revision 263460 vs revision 263444

[H.J. Lu (Intel64 Core i7)]

New failures:

New passes:
FAIL: gcc.dg/uninit-suppress_2.c should not be promoted to error (test for warnings, line 16)
FAIL: gcc.dg/uninit-suppress_2.c should not be promoted to error (test for warnings, line 16)
FAIL: g++.old-deja/g++.mike/p784.C  -std=gnu++11 (test for excess errors)
FAIL: g++.old-deja/g++.mike/p784.C  -std=gnu++14 (test for excess errors)
FAIL: g++.old-deja/g++.mike/p784.C  -std=gnu++98 (test for excess errors)