On Linux/x86_64,

bb2a7f80a98de3febefbb32b1e4898062bdb6af8 is the first bad commit
commit bb2a7f80a98de3febefbb32b1e4898062bdb6af8
Author: Patrick Palka <ppa...@redhat.com>
Date:   Thu Dec 16 13:40:42 2021 -0500

    c++: two-stage name lookup for overloaded operators [PR51577]

caused

FAIL: g++.dg/modules/xtreme-header-3_a.H module-cmi  
(gcm.cache/$srcdir/g++.dg/modules/xtreme-header-3_a.H.gcm)
FAIL: g++.dg/modules/xtreme-header-3_a.H -std=c++17 (internal compiler error: 
tree check: expected var_decl or function_decl or field_decl or type_decl or 
concept_decl or template_decl, have namespace_decl in get_merge_kind, at 
cp/module.cc:10074)
FAIL: g++.dg/modules/xtreme-header-3_a.H -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-3_a.H -std=c++2a (internal compiler error: 
tree check: expected var_decl or function_decl or field_decl or type_decl or 
concept_decl or template_decl, have namespace_decl in get_merge_kind, at 
cp/module.cc:10074)
FAIL: g++.dg/modules/xtreme-header-3_a.H -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-3_a.H -std=c++2b (internal compiler error: 
tree check: expected var_decl or function_decl or field_decl or type_decl or 
concept_decl or template_decl, have namespace_decl in get_merge_kind, at 
cp/module.cc:10074)
FAIL: g++.dg/modules/xtreme-header-3_a.H -std=c++2b (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-5_a.H module-cmi  
(gcm.cache/$srcdir/g++.dg/modules/xtreme-header-5_a.H.gcm)
FAIL: g++.dg/modules/xtreme-header-5_a.H -std=c++17 (internal compiler error: 
tree check: expected none of template_decl, have template_decl in 
add_specializations, at cp/module.cc:12968)
FAIL: g++.dg/modules/xtreme-header-5_a.H -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-5_a.H -std=c++2a (internal compiler error: 
tree check: expected none of template_decl, have template_decl in 
add_specializations, at cp/module.cc:12968)
FAIL: g++.dg/modules/xtreme-header-5_a.H -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header-5_a.H -std=c++2b (internal compiler error: 
tree check: expected none of template_decl, have template_decl in 
add_specializations, at cp/module.cc:12968)
FAIL: g++.dg/modules/xtreme-header-5_a.H -std=c++2b (test for excess errors)
FAIL: g++.dg/modules/xtreme-header_a.H module-cmi  
(gcm.cache/$srcdir/g++.dg/modules/xtreme-header_a.H.gcm)
FAIL: g++.dg/modules/xtreme-header_a.H -std=c++17 (internal compiler error: 
tree check: expected none of template_decl, have template_decl in 
add_specializations, at cp/module.cc:12968)
FAIL: g++.dg/modules/xtreme-header_a.H -std=c++17 (test for excess errors)
FAIL: g++.dg/modules/xtreme-header_a.H -std=c++2a (internal compiler error: 
tree check: expected none of template_decl, have template_decl in 
add_specializations, at cp/module.cc:12968)
FAIL: g++.dg/modules/xtreme-header_a.H -std=c++2a (test for excess errors)
FAIL: g++.dg/modules/xtreme-header_a.H -std=c++2b (internal compiler error: 
tree check: expected none of template_decl, have template_decl in 
add_specializations, at cp/module.cc:12968)
FAIL: g++.dg/modules/xtreme-header_a.H -std=c++2b (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r12-6022/usr 
--enable-clocale=gnu --with-system-zlib --with-demangler-in-ld 
--with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl 
--enable-libmpx x86_64-linux --disable-bootstrap

To reproduce:

$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="modules.exp=g++.dg/modules/xtreme-header-3_a.H 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="modules.exp=g++.dg/modules/xtreme-header-3_a.H 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="modules.exp=g++.dg/modules/xtreme-header-3_a.H 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="modules.exp=g++.dg/modules/xtreme-header-3_a.H 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="modules.exp=g++.dg/modules/xtreme-header-5_a.H 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="modules.exp=g++.dg/modules/xtreme-header-5_a.H 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="modules.exp=g++.dg/modules/xtreme-header_a.H 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="modules.exp=g++.dg/modules/xtreme-header_a.H 
--target_board='unix{-m64\ -march=cascadelake}'"

(Please do not reply to this email, for question about this report, contact me 
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