Avoid build warnings.

llvm-svn: 77271
diff --git a/llvm/lib/Transforms/Scalar/LoopUnroll.cpp b/llvm/lib/Transforms/Scalar/LoopUnroll.cpp
index 3250288..7d551f1 100644
--- a/llvm/lib/Transforms/Scalar/LoopUnroll.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopUnroll.cpp
@@ -121,6 +121,7 @@
   BasicBlock *Header = L->getHeader();
   DEBUG(errs() << "Loop Unroll: F[" << Header->getParent()->getName()
         << "] Loop %" << Header->getName() << "\n");
+  (void)Header;
 
   // Find trip count
   unsigned TripCount = L->getSmallConstantTripCount();