Regressions on releases/gcc-11 at commit r11-11132 vs commit r11-11113 on Linux/i686

[H.J. Lu]

New failures:

New passes:
FAIL: g++.dg/debug/debug4.C -gstabs1 (test for excess errors)
FAIL: g++.dg/debug/debug4.C -gstabs3 (test for excess errors)
FAIL: g++.dg/debug/debug4.C -gstabs (test for excess errors)
FAIL: g++.dg/debug/pr27657.C -gstabs1 (test for excess errors)
FAIL: g++.dg/debug/pr27657.C -gstabs3 (test for excess errors)
FAIL: g++.dg/debug/pr27657.C -gstabs (test for excess errors)