Regressions on master at commit r17-483 vs commit r17-478 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r17-483 vs commit r17-478 on Linux/x86_64
New failures:

New passes:
FAIL: gcc.dg/pr123286.c (test for excess errors)
FAIL: gcc.dg/pr123286.c (test for excess errors)