[NFC] Fix unused var in release builds

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375053 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/LoopUnswitch.cpp b/lib/Transforms/Scalar/LoopUnswitch.cpp
index 6749cda..b410df0 100644
--- a/lib/Transforms/Scalar/LoopUnswitch.cpp
+++ b/lib/Transforms/Scalar/LoopUnswitch.cpp
@@ -1616,6 +1616,7 @@
         // If BI's parent is the only pred of the successor, fold the two blocks
         // together.
         BasicBlock *Pred = BI->getParent();
+        (void)Pred;
         BasicBlock *Succ = BI->getSuccessor(0);
         BasicBlock *SinglePred = Succ->getSinglePredecessor();
         if (!SinglePred) continue;  // Nothing to do.