unused variable warning fix.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244725 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/InstCombine/InstCombineCalls.cpp b/lib/Transforms/InstCombine/InstCombineCalls.cpp
index a7fb74674044801a48c159adc10ca9b9df55ff39..9f366418ea35cb26e595e3bd04de571bd279ffe5 100644 (file)
--- a/lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ b/lib/Transforms/InstCombine/InstCombineCalls.cpp
@@ -970,7 +970,7 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
       return ReplaceInstUsesWith(CI, Op0);
 
     // Zero Mask - select 1st argument.
-    if (auto C = dyn_cast<ConstantAggregateZero>(Mask))
+    if (isa<ConstantAggregateZero>(Mask))
       return ReplaceInstUsesWith(CI, Op0);
 
     // Constant Mask - select 1st/2nd argument lane based on top bit of mask.