Commits on Jan 25, 2019

1. std: Stabilize fixed-width integer atomics …

   This commit stabilizes the `Atomic{I,U}{8,16,32,64}` APIs in the
   `std::sync::atomic` and `core::sync::atomic` modules. Proposed in rust-lang#56753
   and tracked in rust-lang#32976 this feature has been unstable for quite some time
   and is hopefully ready to go over the finish line now!
   
   The API is being stabilized as-is. The API of `AtomicU8` and friends
   mirrors that of `AtomicUsize`. A list of changes made here are:
   
   * A portability documentation section has been added to describe the
     current state of affairs.
   * Emulation of smaller-size atomics with larger-size atomics has been
     documented.
   * As an added bonus, `ATOMIC_*_INIT` is now scheduled for deprecation
     across the board in 1.34.0 now that `const` functions can be invoked
     in statics.
   
   Note that the 128-bit atomic types are omitted from this stabilization
   explicitly. They have far less platform support than the other atomic
   types, and will likely require further discussion about their best
   location.
   
   Closes rust-lang#32976
   Closes rust-lang#56753

   

   alexcrichton committed Jan 25, 2019
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