Regressions on native/master at commit r16-6249 vs commit r16-6248 on Linux/x86_64

[Haochen Jiang]

Regressions on master at commit r16-6249 vs commit r16-6248 on Linux/x86_64
New failures:

New passes:
FAIL: g++.dg/concepts/diagnostic5.C  -std=c++20  at line 7 (test for warnings, line 5)
FAIL: g++.dg/concepts/diagnostic5.C  -std=c++20  at line 7 (test for warnings, line 5)
FAIL: g++.dg/concepts/diagnostic5.C  -std=c++26  at line 7 (test for warnings, line 5)
FAIL: g++.dg/concepts/diagnostic5.C  -std=c++26  at line 7 (test for warnings, line 5)
FAIL: g++.old-deja/g++.pt/typename3.C  -std=gnu++20  (test for errors, line 20)
FAIL: g++.old-deja/g++.pt/typename3.C  -std=gnu++20  (test for errors, line 20)
FAIL: g++.old-deja/g++.pt/typename3.C  -std=gnu++20 (test for excess errors)
FAIL: g++.old-deja/g++.pt/typename3.C  -std=gnu++20 (test for excess errors)
FAIL: g++.old-deja/g++.pt/typename3.C  -std=gnu++26  (test for errors, line 20)
FAIL: g++.old-deja/g++.pt/typename3.C  -std=gnu++26  (test for errors, line 20)
FAIL: g++.old-deja/g++.pt/typename3.C  -std=gnu++26 (test for excess errors)
FAIL: g++.old-deja/g++.pt/typename3.C  -std=gnu++26 (test for excess errors)
FAIL: g++.old-deja/g++.pt/typename4.C  -std=gnu++20  (test for errors, line 25)
FAIL: g++.old-deja/g++.pt/typename4.C  -std=gnu++20  (test for errors, line 25)
FAIL: g++.old-deja/g++.pt/typename4.C  -std=gnu++20 (test for excess errors)
FAIL: g++.old-deja/g++.pt/typename4.C  -std=gnu++20 (test for excess errors)
FAIL: g++.old-deja/g++.pt/typename4.C  -std=gnu++26  (test for errors, line 25)
FAIL: g++.old-deja/g++.pt/typename4.C  -std=gnu++26  (test for errors, line 25)
FAIL: g++.old-deja/g++.pt/typename4.C  -std=gnu++26 (test for excess errors)
FAIL: g++.old-deja/g++.pt/typename4.C  -std=gnu++26 (test for excess errors)
FAIL: g++.old-deja/g++.pt/typename6.C  -std=c++20  (test for errors, line 18)
FAIL: g++.old-deja/g++.pt/typename6.C  -std=c++20  (test for errors, line 18)
FAIL: g++.old-deja/g++.pt/typename6.C  -std=c++20 (test for excess errors)
FAIL: g++.old-deja/g++.pt/typename6.C  -std=c++20 (test for excess errors)
FAIL: g++.old-deja/g++.pt/typename6.C  -std=c++26  (test for errors, line 18)
FAIL: g++.old-deja/g++.pt/typename6.C  -std=c++26  (test for errors, line 18)
FAIL: g++.old-deja/g++.pt/typename6.C  -std=c++26 (test for excess errors)
FAIL: g++.old-deja/g++.pt/typename6.C  -std=c++26 (test for excess errors)