Regressions on native/master at commit r16-3997 vs commit r16-3994 on Linux/x86_64

[Haochen Jiang]

Regressions on master at commit r16-3997 vs commit r16-3994 on Linux/x86_64
New failures:
FAIL: g++.dg/modules/xtreme-header-2_b.C -std=c++26 (internal compiler error: canonical types differ for identical types 'auto' and 'auto')
FAIL: g++.dg/modules/xtreme-header-2_b.C -std=c++26 (internal compiler error: canonical types differ for identical types 'auto' and 'auto')
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_b.C -std=c++26 (internal compiler error: canonical types differ for identical types 'auto' and 'auto')
FAIL: g++.dg/modules/xtreme-header_b.C -std=c++26 (internal compiler error: canonical types differ for identical types 'auto' and 'auto')
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)
FAIL: g++.dg/modules/xtreme-tr1_b.C -std=c++26 (internal compiler error: canonical types differ for identical types 'auto' and 'auto')
FAIL: g++.dg/modules/xtreme-tr1_b.C -std=c++26 (internal compiler error: canonical types differ for identical types 'auto' and 'auto')
FAIL: g++.dg/modules/xtreme-tr1_b.C -std=c++26 (test for excess errors)
FAIL: g++.dg/modules/xtreme-tr1_b.C -std=c++26 (test for excess errors)

New passes: