[PATCH] [libcxx] Add __atomic header that handles needed atomic operations.

[Jonathan Roelofs]

================
Comment at: include/__atomic:85
@@ +84,3 @@
+{
+    *__dest = __val;
+}
----------------
Should these fall back on the __sync_* ones instead of just dropping the atomicness? It seems a little precarious to silently default to non-atomic implementations for these (unless this is for a single-threaded build of the library).

http://reviews.llvm.org/D10406

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