Remove unused code.[NFC]

Differential Revision: D54888372

Author: Xin Tong

lib/LLVMIRCodeGen/BundleSaver.cpp

@@ -173,8 +173,6 @@ BundleSaver::BundleSaver(const LLVMBackend &llvmBackend,
                          llvm::StringRef outputDir, llvm::StringRef bundleName)
     : irgen_(llvmBackend.createIRGen(nullptr, allocationsInfo_)),
       bundleAPI_(llvmBackend.getOptions().getBundleAPI()) {
-  llvm::SmallVector<std::string, 8> targetFeatures(llvmTargetFeatures.begin(),
-                                                   llvmTargetFeatures.end());
   irgen_->setBundleName(bundleName.str());
   irgen_->setOutputDir(outputDir);
   irgen_->setObjectRegistry(llvmBackend.getObjectRegistry());

lib/LLVMIRCodeGen/LLVMBackend.cpp

@@ -688,8 +688,6 @@ std::unique_ptr<CompiledFunction>
 LLVMBackend::compileIRWithoutConstants(IRFunction *IR) const {
   AllocationsInfo allocationsInfo;
   std::unique_ptr<LLVMIRGen> irgen = createIRGen(IR, allocationsInfo);
-  llvm::SmallVector<std::string, 8> targetFeatures(llvmTargetFeatures.begin(),
-                                                   llvmTargetFeatures.end());
   irgen->initTargetMachine(getOptions());
   irgen->initCodeGen();
   irgen->setIRFunction(IR);
@@ -736,8 +734,6 @@ LLVMBackend::compile(Function *F, const BackendOptions &opts) const {
 void LLVMBackend::save(Function *F, llvm::StringRef outputDir,
                        llvm::StringRef bundleName,
                        llvm::StringRef mainEntryName) const {
-  llvm::SmallVector<std::string, 8> targetFeatures(llvmTargetFeatures.begin(),
-                                                   llvmTargetFeatures.end());
   auto IR = generateAndOptimizeIR(F, *this, shouldShareBuffers());
   auto bundleSaver = createBundleSaver(*this, outputDir, bundleName);
   bundleSaver->save(mainEntryName, IR.get());