[r17-810 Regression] FAIL: g++.dg/reflect/define_static_array4.C -std=c++26 (test for excess errors) on Linux/x86_64

On Linux/x86_64,

7239744d25dadf39f431dfe38f3c03942acdb979 is the first bad commit
commit 7239744d25dadf39f431dfe38f3c03942acdb979
Author: Tomasz Kamiński <[email protected]>
Date:   Fri Apr 24 05:26:13 2026 +0200

    libstdc++: Make ref_view<R> statically sized if R has static size

caused

FAIL: g++.dg/reflect/define_static_array4.C  -std=c++26 (test for excess errors)

with GCC configured with

../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r17-810/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/reflect/define_static_array4.C --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/reflect/define_static_array4.C --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/reflect/define_static_array4.C --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/reflect/define_static_array4.C --target_board='unix{-m64\ -march=cascadelake}'"

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(If you met problems with cascadelake related, disabling AVX512F in command line might save that.)
(However, please make sure that there is no potential problems with AVX512.)