Regressions on native/master at commit r13-4801 vs commit r13-4792 on Linux/x86_64

[H. J. Lu]

Regressions on native/master at commit r13-4801 vs commit r13-4792 on Linux/x86_64
New failures:

New passes:
FAIL: g++.dg/other/pr39060.C  -std=c++20 (internal compiler error: canonical types differ for identical types 'void (A::)(void*)' and 'void (A::)(void*)')
FAIL: g++.dg/other/pr39060.C  -std=c++20 (test for excess errors)
FAIL: g++.dg/other/pr39060.C  -std=c++98 (internal compiler error: canonical types differ for identical types 'void (A::)(void*)' and 'void (A::)(void*)')
FAIL: g++.dg/other/pr39060.C  -std=c++98 (test for excess errors)