std: Add init and uninit to mem. Replace direct intrinsic usage

src/test/bench/shootout-k-nucleotide.rs

@@ -16,8 +16,8 @@ use std::cast::transmute;
 use std::i32::range;
 use std::libc::{STDIN_FILENO, c_int, fdopen, fgets, fileno, fopen, fstat};
 use std::libc::{stat, strlen};
+use std::mem::init;
 use std::ptr::null;
-use std::unstable::intrinsics::init;
 use std::vec::{reverse};
 
 static LINE_LEN: uint = 80;

src/test/run-pass/issue-10714.rs

@@ -10,5 +10,5 @@
 
 enum v {}
 pub fn main() {
-    let y: v = unsafe { ::std::unstable::intrinsics::uninit() };
+    let y: v = unsafe { ::std::mem::uninit() };
 }

src/test/run-pass/uninit-empty-types.rs

@@ -11,14 +11,14 @@
 // Test the uninit() construct returning various empty types.
 
 use std::vec;
-use std::unstable::intrinsics;
+use std::mem;
 
 #[deriving(Clone)]
 struct Foo;
 
 pub fn main() {
     unsafe {
-        let _x: Foo = intrinsics::uninit();
-        let _x: [Foo, ..2] = intrinsics::uninit();
+        let _x: Foo = mem::uninit();
+        let _x: [Foo, ..2] = mem::uninit();
     }
 }