[r16-4069 Regression] FAIL: gfortran.dg/pr87908.f90 -Os (test for excess errors) on Linux/x86_64

[Jiang, Haochen]

On Linux/x86_64,

e77daa57300ba2cb116af8dd24f58cad00dc669c is the first bad commit
commit e77daa57300ba2cb116af8dd24f58cad00dc669c
Author: Paul Thomas <pault@gcc.gnu.org>
Date:   Wed Sep 24 08:01:23 2025 +0100

    Fortran: Fix ICE in check_interface [PR87908]

caused

FAIL: gfortran.dg/pr87908.f90   -O0  (internal compiler error: Segmentation fault)
FAIL: gfortran.dg/pr87908.f90   -O0  (test for excess errors)
FAIL: gfortran.dg/pr87908.f90   -O1  (internal compiler error: Segmentation fault)
FAIL: gfortran.dg/pr87908.f90   -O1  (test for excess errors)
FAIL: gfortran.dg/pr87908.f90   -O2  (internal compiler error: Segmentation fault)
FAIL: gfortran.dg/pr87908.f90   -O2  (test for excess errors)
FAIL: gfortran.dg/pr87908.f90   -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions  (internal compiler error: Segmentation fault)
FAIL: gfortran.dg/pr87908.f90   -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions  (test for excess errors)
FAIL: gfortran.dg/pr87908.f90   -O3 -g  (internal compiler error: Segmentation fault)
FAIL: gfortran.dg/pr87908.f90   -O3 -g  (test for excess errors)
FAIL: gfortran.dg/pr87908.f90   -Os  (internal compiler error: Segmentation fault)
FAIL: gfortran.dg/pr87908.f90   -Os  (test for excess errors)

with GCC configured with

../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-4069/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=gfortran.dg/pr87908.f90 --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gfortran.dg/pr87908.f90 --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gfortran.dg/pr87908.f90 --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gfortran.dg/pr87908.f90 --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.)