Unused var warning.

llvm-svn: 158944
diff --git a/lld/lib/ReaderWriter/Native/ReaderNative.cpp b/lld/lib/ReaderWriter/Native/ReaderNative.cpp
index b617a4f..29935e3 100644
--- a/lld/lib/ReaderWriter/Native/ReaderNative.cpp
+++ b/lld/lib/ReaderWriter/Native/ReaderNative.cpp
@@ -322,7 +322,8 @@
                     << ", size=" << a->size()
                     << "\n");
       for (const Reference *r : *a ) {
-       DEBUG_WITH_TYPE("ReaderNative", llvm::dbgs() 
+        (void)r;
+        DEBUG_WITH_TYPE("ReaderNative", llvm::dbgs() 
                     << "        offset=" 
                     << llvm::format("0x%03X", r->offsetInAtom())
                     << ", kind=" << r->kind()