s390x cannot lower powi intrinsic

[gnzlbg]

powi errors with incorrect return type on s390x-unknown-linux-gnu

Intrinsic has incorrect return type!
void (<4 x float>*, <4 x float>*, i32)* @llvm.powi.v4f32
in function _ZN115_$LT$packed_simd..Simd$LT$$u5b$f32$u3b$$u20$_$u5d$$GT$$u20$as$u20$packed_simd..codegen..math..float..powi..Powi$GT$4powi17h0ea4c1312189530eE
LLVM ERROR: Broken function found, compilation aborted!
error: Could not compile `packed_simd`.