Andrew Kelley 1fa2e911d9 std.atomic: remove some APIs
* remove `std.atomic.Ordering`
  - it is provided by the language with `std.builtin.AtomicOrder`.
* remove `std.atomic.fence`
  - it is provided by the language with `@fence`.
* remove `std.atomic.compilerFence`
  - if this is desired, it should be a language feature, not a standard
    library function with inline asm.
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