Add regression test for #17170

Closes #17170.

src/test/run-pass/issue-17170.rs

@@ -0,0 +1,20 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![feature(simd)]
+
+#[simd]
+struct T(f64, f64, f64);
+
+static X: T = T(0.0, 0.0, 0.0);
+
+fn main() {
+    let _ = X;
+}