Regressions on master at commit r15-1761 vs commit r15-1759 on Linux/x86_64

[Haochen Jiang via Gcc-regression]

Regressions on master at commit r15-1761 vs commit r15-1759 on Linux/x86_64
New failures:

New passes:
FAIL: g++.dg/cpp2a/spaceship-narrowing1.C  -std=c++20 (test for excess errors)