prevent GCSE from forwarding stores to loads around vaarg. This is uggly, and I am trying to fix the AliasInfo, as it should catch the problem instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22266 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/LoadValueNumbering.cpp

@@ -328,6 +328,10 @@ void LoadVN::getEqualNumberNodes(Value *V,
       LoadInvalidatedInBBBefore = true;
       break;
     }
+    if (dyn_cast<VAArgInst>(I)) {
+      LoadInvalidatedInBBBefore = true;
+      break;
+    }
   }
 
   // Figure out if the load is invalidated between the load and the exit of the