Attempt to fix buildbot failure in commit 1bb57bac959ac163fd7d8a76d734ca3e0ecee6ab.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358786 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp
index 6309d64..bcc523f 100644
--- a/lib/CodeGen/MachineFunction.cpp
+++ b/lib/CodeGen/MachineFunction.cpp
@@ -814,7 +814,7 @@
   I->setPostInstrSymbol(*this, EndLabel);
 
   DIType *DI = dyn_cast<DIType>(MD);
-  CodeViewHeapAllocSites.push_back({BeginLabel, EndLabel, DI});
+  CodeViewHeapAllocSites.push_back(std::make_tuple(BeginLabel, EndLabel, DI));
 }
 
 /// \}