[PATCH] Add missing atomic libcall support.

[David Majnemer]

================
Comment at: lib/CodeGen/CGAtomic.cpp:811-815
@@ +810,7 @@
+
+    case AtomicExpr::AO__c11_atomic_load:
+    case AtomicExpr::AO__c11_atomic_store:
+    case AtomicExpr::AO__c11_atomic_exchange:
+    case AtomicExpr::AO__c11_atomic_compare_exchange_weak:
+    case AtomicExpr::AO__c11_atomic_compare_exchange_strong:
+    case AtomicExpr::AO__atomic_load_n:
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Do any of the tests cover this part of the change?

http://reviews.llvm.org/D10847

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