PPCInstrInfo.cpp: Fix one "unused" warning.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144071 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCInstrInfo.cpp b/lib/Target/PowerPC/PPCInstrInfo.cpp
index 36a10f4..f148e9d 100644
--- a/lib/Target/PowerPC/PPCInstrInfo.cpp
+++ b/lib/Target/PowerPC/PPCInstrInfo.cpp
@@ -52,6 +52,7 @@
   // Should use subtarget info to pick the right hazard recognizer.  For
   // now, always return a PPC970 recognizer.
   const TargetInstrInfo *TII = TM->getInstrInfo();
+  (void)TII;
   assert(TII && "No InstrInfo?");
 
   unsigned Directive = TM->getSubtarget<PPCSubtarget>().getDarwinDirective();