Add compile-fail test for E0444

src/librustc_typeck/diagnostics.rs

@@ -3042,7 +3042,7 @@ with yours. Example:
 struct f64x2(f64, f64);
 
 extern "platform-intrinsic" {
-    fn x86_mm_movemask_pd(x: f64x2, y: f64x2) -> i32; // ok!
+    fn x86_mm_movemask_pd(x: f64x2) -> i32; // ok!
 }
 ```
 "##,

src/test/compile-fail/intrinsic-invalid-number-of-arguments.rs

@@ -0,0 +1,24 @@
+// Copyright 2014 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.
+
+// Test number of arguments in platform-specific intrinsic function
+// This is the error E0444
+
+#![feature(repr_simd, platform_intrinsics)]
+
+#[repr(simd)]
+struct f64x2(f64, f64);
+
+extern "platform-intrinsic" {
+    fn x86_mm_movemask_pd(x: f64x2, y: f64x2, z: f64x2) -> i32; //~ platform-specific intrinsic
+}
+
+pub fn main() {
+}