Add another autovectorization codegen test using array zip-map

Author: scottmcm

tests/codegen/autovectorize-f32x4.rs

@@ -1,6 +1,7 @@
-// compile-flags: -C opt-level=3
+// compile-flags: -C opt-level=3 -Z merge-functions=disabled
 // only-x86_64
 #![crate_type = "lib"]
+#![feature(array_zip)]
 
 // CHECK-LABEL: @auto_vectorize_direct
 #[no_mangle]
@@ -30,3 +31,13 @@ pub fn auto_vectorize_loop(a: [f32; 4], b: [f32; 4]) -> [f32; 4] {
     }
     c
 }
+
+// CHECK-LABEL: @auto_vectorize_array_zip_map
+#[no_mangle]
+pub fn auto_vectorize_array_zip_map(a: [f32; 4], b: [f32; 4]) -> [f32; 4] {
+// CHECK: load <4 x float>
+// CHECK: load <4 x float>
+// CHECK: fadd <4 x float>
+// CHECK: store <4 x float>
+    a.zip(b).map(|(a, b)| a + b)
+}