Attempt to unbreak the expensive-checks-win bot

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316625 91177308-0d34-0410-b5e6-96231b3b80d8

Author: mssimpso

lib/Transforms/IPO/CalledValuePropagation.cpp

@@ -153,7 +153,8 @@ class CVPLatticeFunc
     std::set<Function *, CVPLatticeVal::Compare> Union;
     std::set_union(X.getFunctions().begin(), X.getFunctions().end(),
                    Y.getFunctions().begin(), Y.getFunctions().end(),
-                   std::inserter(Union, Union.begin()));
+                   std::inserter(Union, Union.begin()),
+                   CVPLatticeVal::Compare{});
     if (Union.size() > MaxFunctionsPerValue)
       return getOverdefinedVal();
     return CVPLatticeVal(std::move(Union));