math: fix two fma issues (only affects non-nearest rounding mode, x86)

[musl] / src / thread / microblaze / __set_thread_area.s

.global __set_thread_area
.type   __set_thread_area,@function
__set_thread_area:
        ori      r21, r5, 0
        rtsd     r15, 8
        ori      r3, r0, 0