Regressions on trunk at revision 201758 vs revision 201720

[H.J. Lu Intel64]

New failures:

New passes:
FAIL: g++.dg/debug/pr44182.C -gstabs1 (test for excess errors)
FAIL: gcc.dg/uninit-15-O0.c (test for excess errors)
FAIL: gcc.dg/uninit-15.c  (test for warnings, line 24)
FAIL: gcc.dg/uninit-15.c (test for excess errors)
FAIL: gcc.dg/uninit-2-O0.c (test for excess errors)
FAIL: gcc.dg/uninit-2.c (test for excess errors)
FAIL: gcc.dg/uninit-3-O0.c (test for excess errors)
FAIL: gcc.dg/uninit-3.c (test for excess errors)
FAIL: gcc.dg/uninit-4-O0.c (test for excess errors)
FAIL: gcc.dg/uninit-4.c (test for excess errors)
FAIL: gcc.dg/uninit-5-O0.c (test for excess errors)