Peter Marheine 998c10d6b6 Add singlethreaded fence intrinsics.
These new intrinsics are comparable to `atomic_signal_fence` in C++,
ensuring the compiler will not reorder memory accesses across the
barrier, nor will it emit any machine instructions for it.

Closes #24118, implementing RFC 888.
2015-04-25 19:41:21 -06:00
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