Switch test back to run-pass.

tests/ui/simd/issue-105439.rs

@@ -1,16 +1,25 @@
-// build-pass
-
-#![crate_type = "lib"]
+// run-pass
+// compile-flags: -O -Zverify-llvm-ir
 
 #![feature(repr_simd)]
 #![feature(platform_intrinsics)]
 
 #[allow(non_camel_case_types)]
 #[derive(Clone, Copy)]
 #[repr(simd)]
-pub struct i32x4([i32; 4]);
+struct i32x4([i32; 4]);
+
+extern "platform-intrinsic" {
+    pub(crate) fn simd_add<T>(x: T, y: T) -> T;
+}
+
+#[inline(always)]
+fn to_array(a: i32x4) -> [i32; 4] {
+    a.0
+}
 
-pub fn f(a: i32x4) -> [i32; 4] {
-    let b = a;
-    b.0
+fn main() {
+    let a = i32x4([1, 2, 3, 4]);
+    let b = unsafe { simd_add(a, a) };
+    assert_eq!(to_array(b), [2, 4, 6, 8]);
 }