[r16-4425 Regression] FAIL: std/time/freestanding.cc -std=gnu++17 (test for excess errors) on Linux/x86_64

[Jiang, Haochen]

On Linux/x86_64,

5dba17a3e709859968f939354e6e5e8d796012d3 is the first bad commit
commit 5dba17a3e709859968f939354e6e5e8d796012d3
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Oct 9 11:09:34 2025 +0100

    libstdc++: Avoid overflow in timeout conversions [PR113327]

caused

FAIL: std/time/freestanding.cc  -std=gnu++17 (test for excess errors)

with GCC configured with

../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-4425/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}/x86_64-linux/libstdc++-v3/testsuite && make check RUNTESTFLAGS="conformance.exp=std/time/freestanding.cc --target_board='unix{-m32}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check RUNTESTFLAGS="conformance.exp=std/time/freestanding.cc --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check RUNTESTFLAGS="conformance.exp=std/time/freestanding.cc --target_board='unix{-m64}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check RUNTESTFLAGS="conformance.exp=std/time/freestanding.cc --target_board='unix{-m64\ -march=cascadelake}'"

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