Add atomic load/store intrinsics to the compiler. #6437
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This pull request adds 4 atomic intrinsics to the compiler, in preparation for #5042.
atomic_load(src: &int) -> int
performs an atomic sequentially consistent load.atomic_load_acq(src: &int) -> int
performs an atomic acquiring load.atomic_store(dst: &mut int, val: int)
performs an atomic sequentially consistent store.atomic_store_rel(dst: &mut int, val: int)
performs an atomic releasing store.For more information about the whole acquire/release thing: http://llvm.org/docs/Atomics.html
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