Regressions on master at commit r15-6084 vs commit r15-6079 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r15-6084 vs commit r15-6079 on Linux/x86_64
New failures:

New passes:
FAIL: g++.dg/cpp0x/trivial1.C  -std=c++26 (test for excess errors)
FAIL: g++.dg/cpp0x/trivial1.C  -std=c++26 (test for excess errors)