Merge pull request rust-lang#4274 from RalfJung/import-intrinsics

use std-declared intrinsics rather than copying the declaration

Author: RalfJung

src/tools/miri/tests/fail/intrinsics/ctlz_nonzero.rs

@@ -1,13 +1,8 @@
-#![feature(intrinsics)]
-
-mod rusti {
-    #[rustc_intrinsic]
-    pub unsafe fn ctlz_nonzero<T>(x: T) -> u32;
-}
+#![feature(core_intrinsics)]
 
 pub fn main() {
     unsafe {
-        use crate::rusti::*;
+        use std::intrinsics::*;
 
         ctlz_nonzero(0u8); //~ ERROR: `ctlz_nonzero` called on 0
     }

src/tools/miri/tests/fail/intrinsics/cttz_nonzero.rs

@@ -1,13 +1,8 @@
-#![feature(intrinsics)]
-
-mod rusti {
-    #[rustc_intrinsic]
-    pub unsafe fn cttz_nonzero<T>(x: T) -> u32;
-}
+#![feature(core_intrinsics)]
 
 pub fn main() {
     unsafe {
-        use crate::rusti::*;
+        use std::intrinsics::*;
 
         cttz_nonzero(0u8); //~ ERROR: `cttz_nonzero` called on 0
     }

src/tools/miri/tests/fail/intrinsics/float_to_int_32_inf1.rs

@@ -1,8 +1,6 @@
-#![feature(intrinsics)]
-
+#![feature(core_intrinsics)]
 // Directly call intrinsic to avoid debug assertions in libstd
-#[rustc_intrinsic]
-unsafe fn float_to_int_unchecked<Float: Copy, Int: Copy>(value: Float) -> Int;
+use std::intrinsics::float_to_int_unchecked;
 
 fn main() {
     unsafe {

src/tools/miri/tests/fail/intrinsics/float_to_int_32_infneg1.rs

@@ -1,8 +1,6 @@
-#![feature(intrinsics)]
-
+#![feature(core_intrinsics)]
 // Directly call intrinsic to avoid debug assertions in libstd
-#[rustc_intrinsic]
-unsafe fn float_to_int_unchecked<Float: Copy, Int: Copy>(value: Float) -> Int;
+use std::intrinsics::float_to_int_unchecked;
 
 fn main() {
     unsafe {

src/tools/miri/tests/fail/intrinsics/float_to_int_32_nan.rs

@@ -1,8 +1,6 @@
-#![feature(intrinsics)]
-
+#![feature(core_intrinsics)]
 // Directly call intrinsic to avoid debug assertions in libstd
-#[rustc_intrinsic]
-unsafe fn float_to_int_unchecked<Float: Copy, Int: Copy>(value: Float) -> Int;
+use std::intrinsics::float_to_int_unchecked;
 
 fn main() {
     unsafe {

src/tools/miri/tests/fail/intrinsics/float_to_int_32_nanneg.rs

@@ -1,8 +1,6 @@
-#![feature(intrinsics)]
-
+#![feature(core_intrinsics)]
 // Directly call intrinsic to avoid debug assertions in libstd
-#[rustc_intrinsic]
-unsafe fn float_to_int_unchecked<Float: Copy, Int: Copy>(value: Float) -> Int;
+use std::intrinsics::float_to_int_unchecked;
 
 fn main() {
     unsafe {

src/tools/miri/tests/fail/intrinsics/float_to_int_32_neg.rs

@@ -1,8 +1,6 @@
-#![feature(intrinsics)]
-
+#![feature(core_intrinsics)]
 // Directly call intrinsic to avoid debug assertions in libstd
-#[rustc_intrinsic]
-unsafe fn float_to_int_unchecked<Float: Copy, Int: Copy>(value: Float) -> Int;
+use std::intrinsics::float_to_int_unchecked;
 
 fn main() {
     unsafe {

src/tools/miri/tests/fail/intrinsics/float_to_int_32_too_big1.rs

@@ -1,8 +1,6 @@
-#![feature(intrinsics)]
-
+#![feature(core_intrinsics)]
 // Directly call intrinsic to avoid debug assertions in libstd
-#[rustc_intrinsic]
-unsafe fn float_to_int_unchecked<Float: Copy, Int: Copy>(value: Float) -> Int;
+use std::intrinsics::float_to_int_unchecked;
 
 fn main() {
     unsafe {

src/tools/miri/tests/fail/intrinsics/float_to_int_32_too_big2.rs

@@ -1,8 +1,6 @@
-#![feature(intrinsics)]
-
+#![feature(core_intrinsics)]
 // Directly call intrinsic to avoid debug assertions in libstd
-#[rustc_intrinsic]
-unsafe fn float_to_int_unchecked<Float: Copy, Int: Copy>(value: Float) -> Int;
+use std::intrinsics::float_to_int_unchecked;
 
 fn main() {
     unsafe {

src/tools/miri/tests/fail/intrinsics/float_to_int_32_too_small1.rs

@@ -1,8 +1,6 @@
-#![feature(intrinsics)]
-
+#![feature(core_intrinsics)]
 // Directly call intrinsic to avoid debug assertions in libstd
-#[rustc_intrinsic]
-unsafe fn float_to_int_unchecked<Float: Copy, Int: Copy>(value: Float) -> Int;
+use std::intrinsics::float_to_int_unchecked;
 
 fn main() {
     unsafe {