Allow simd_insert and simd_extract in const_fn

Author: gnzlbg

src/librustc_mir/transform/qualify_consts.rs

@@ -557,6 +557,8 @@ impl Qualif for IsNotPromotable {
                             | "saturating_add"
                             | "saturating_sub"
                             | "transmute"
+                            | "simd_insert"
+                            | "simd_extract"
                             => return true,
 
                             _ => {}

src/test/ui/consts/const-eval/simd/insert_extract-fail.rs

@@ -1,4 +1,4 @@
-// compile-flags: -Zunleash-the-miri-inside-of-you
+#![feature(const_fn)]
 #![feature(repr_simd)]
 #![feature(platform_intrinsics)]
 #![allow(non_camel_case_types)]

src/test/ui/consts/const-eval/simd/insert_extract.rs

@@ -1,5 +1,5 @@
 // run-pass
-// compile-flags: -Zunleash-the-miri-inside-of-you
+#![feature(const_fn)]
 #![feature(repr_simd)]
 #![feature(platform_intrinsics)]
 #![allow(non_camel_case_types)]