[Bug target/118949] RISC-V: Extra FRM writes since GCC-14.2

[vineetg at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118949

--- Comment #4 from Vineet Gupta <vineetg at gcc dot gnu.org> ---
Also slightly better test so avoid cpp/installed headers and use bare cc1

void func(const float *a, const float *b, float *c)
{
    for (long i = 0; i < 1024; ++i) {
        float a_l = __builtin_lround(a[i]);
        float b_l = __builtin_lround(b[i]);
        c[i] = a_l + b_l;
    }
}