[AMDGPU] Remove unused variable

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353704 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/AMDGPU/AMDGPUAtomicOptimizer.cpp b/lib/Target/AMDGPU/AMDGPUAtomicOptimizer.cpp
index f3d128c..3210df4 100644
--- a/lib/Target/AMDGPU/AMDGPUAtomicOptimizer.cpp
+++ b/lib/Target/AMDGPU/AMDGPUAtomicOptimizer.cpp
@@ -212,8 +212,6 @@
                                            Instruction::BinaryOps Op,
                                            unsigned ValIdx,
                                            bool ValDivergent) const {
-  LLVMContext &Context = I.getContext();
-
   // Start building just before the instruction.
   IRBuilder<> B(&I);