Silence 'variable unused' warning in release mode

llvm-svn: 177515
diff --git a/polly/lib/CodeGen/IslCodeGeneration.cpp b/polly/lib/CodeGen/IslCodeGeneration.cpp
index 721596a..83a5884 100644
--- a/polly/lib/CodeGen/IslCodeGeneration.cpp
+++ b/polly/lib/CodeGen/IslCodeGeneration.cpp
@@ -126,6 +126,7 @@
 
 void RuntimeDebugBuilder::createIntPrinter(Value *V) {
   IntegerType *Ty = dyn_cast<IntegerType>(V->getType());
+  (void)Ty;
   assert(Ty && Ty->getBitWidth() == 64 &&
          "Cannot insert printer for this type.");