R600ControlFlowFinalizer.cpp: Fix a warning. [-Wunused-variable]

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179263 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/R600/R600ControlFlowFinalizer.cpp b/lib/Target/R600/R600ControlFlowFinalizer.cpp
index 8b73b46..bc1ca58 100644
--- a/lib/Target/R600/R600ControlFlowFinalizer.cpp
+++ b/lib/Target/R600/R600ControlFlowFinalizer.cpp
@@ -279,6 +279,7 @@
               getHWInstrDesc(CF_POP))
               .addImm(CfCount + 1)
               .addImm(1);
+          (void)MIb;
           DEBUG(dbgs() << CfCount << ":"; MIb->dump(););
           MI->eraseFromParent();
           CfCount++;