On Linux/x86_64,

3a2257e6b3fa288d6c50831987949b9ff7dfb865 is the first bad commit
commit 3a2257e6b3fa288d6c50831987949b9ff7dfb865
Author: Marek Polacek <pola...@redhat.com>
Date:   Sat Dec 4 12:07:41 2021 -0500

    c++: Fix for decltype and bit-fields [PR95009]

caused

FAIL: g++.dg/cpp0x/decltype-bitfield1.C  -std=c++14 (test for excess errors)
FAIL: g++.dg/cpp0x/decltype-bitfield1.C  -std=c++17 (test for excess errors)
FAIL: g++.dg/cpp0x/decltype-bitfield1.C  -std=c++2a (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r12-5823/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="dg.exp=g++.dg/cpp0x/decltype-bitfield1.C 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=g++.dg/cpp0x/decltype-bitfield1.C 
--target_board='unix{-m32\ -march=cascadelake}'"

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