[Bug tree-optimization/90106] builtin sqrt() ignoring libm's sqrt call result

[JunMa at linux dot alibaba.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90106

--- Comment #19 from JunMa <JunMa at linux dot alibaba.com> ---
we can skip the target by adding 
/* { dg-skip-if "need hardfp abi" { *-*-* } { "-mfloat-abi=soft" } { "" } } */
to testcase.