Add a user-facing fence for atomics #13912
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Add `atomicFence()` as the user-facing fence for atomics. Like the
atomic methods, this takes a param memoryOrder and is sequentially
consistent by default. This looks like:
```chpl
proc atomicFence(param order:memoryOrder = memoryOrder.seqCst) { ... }
```
mppf
approved these changes
Aug 28, 2019
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Add
atomicFence()as the user-facing fence for atomics. Like theatomic methods, this takes a param memoryOrder and is sequentially
consistent by default. This looks like:
Closes #13830
Closes https://github.com/Cray/chapel-private/issues/394