Regressions on native/master at commit r16-1251 vs commit r16-1203 on Linux/x86_64

[Haochen Jiang]

Regressions on master at commit r16-1251 vs commit r16-1203 on Linux/x86_64
New failures:
FAIL: g++.dg/modules/xtreme-header-2_b.C -std=c++26 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-2_b.C -std=c++26 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-5_b.C -std=c++26 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-5_b.C -std=c++26 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-6_b.C -std=c++26 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-6_b.C -std=c++26 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-7_b.C -std=c++26 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-7_b.C -std=c++26 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-8.C module-cmi xstd (gcm.cache/xstd.gcm)
FAIL: g++.dg/modules/xtreme-header-8.C module-cmi xstd (gcm.cache/xstd.gcm)
FAIL: g++.dg/modules/xtreme-header-8.C -std=c++26 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-8.C -std=c++26 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header_b.C -std=c++26 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header_b.C -std=c++26 (test for excess errors)

New passes: