std: Fix missing stability in sync

* The `sync` module is stable
* The `sync::mpsc` module is stable
* The `Sender::send` method is stable.
* The `Once::doit` method is now removed.
* Deprecated atomic initializers are removed.
* Renamed atomic initializers are now stable.

src/libstd/sync/mod.rs

@@ -15,7 +15,7 @@
 //! and/or blocking at all, but rather provide the necessary tools to build
 //! other types of concurrent primitives.
 
-#![experimental]
+#![stable]
 
 pub use alloc::arc::{Arc, Weak};
 pub use core::atomic;

src/libstd/sync/mpsc/mod.rs

@@ -163,6 +163,8 @@
 //! }
 //! ```
 
+#![stable]
+
 // A description of how Rust's channel implementation works
 //
 // Channels are supposed to be the basic building block for all other
@@ -565,6 +567,7 @@ impl<T: Send> Sender<T> {
     /// drop(rx);
     /// assert_eq!(tx.send(1i).err().unwrap().0, 1);
     /// ```
+    #[stable]
     pub fn send(&self, t: T) -> Result<(), SendError<T>> {
         let (new_inner, ret) = match *unsafe { self.inner() } {
             Flavor::Oneshot(ref p) => {

src/libstd/sync/once.rs

@@ -121,10 +121,6 @@ impl Once {
             unsafe { self.mutex.destroy() }
         }
     }
-
-    /// Deprecated
-    #[deprecated = "renamed to `call_once`"]
-    pub fn doit<F>(&'static self, f: F) where F: FnOnce() { self.call_once(f) }
 }
 
 #[cfg(test)]