[r16-1429 Regression] FAIL: g++.target/i386/vect-pragma-target-2.C -std=gnu++98 (test for excess errors) on Linux/x86_64

On Linux/x86_64,

dcb9af06212e8bb36e84a1b8498c625c29abeb6f is the first bad commit
commit dcb9af06212e8bb36e84a1b8498c625c29abeb6f
Author: Gwenole Beauchesne <[email protected]>
Date:   Mon Jun 2 14:44:55 2025 -0700

    c/c++: Handle '#pragma GCC target optimize' early [PR48026]

caused

FAIL: gcc.target/i386/vect-pragma-target-2.c (test for excess errors)
FAIL: g++.target/i386/vect-pragma-target-2.C  -std=gnu++17 (test for excess errors)
FAIL: g++.target/i386/vect-pragma-target-2.C  -std=gnu++26 (test for excess errors)
FAIL: g++.target/i386/vect-pragma-target-2.C  -std=gnu++98 (test for excess errors)

with GCC configured with

../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-1429/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="i386.exp=gcc.target/i386/vect-pragma-target-2.c --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="i386.exp=gcc.target/i386/vect-pragma-target-2.c --target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="i386.exp=g++.target/i386/vect-pragma-target-2.C --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="i386.exp=g++.target/i386/vect-pragma-target-2.C --target_board='unix{-m64\ -march=cascadelake}'"

(Please do not reply to this email, for question about this report, contact me at haochen dot jiang at intel.com.)
(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.)