[mlir] Remove unused local variables (NFC) (#140423)

Author: kazutakahirata

mlir/lib/Target/LLVMIR/Dialect/LLVMIR/LLVMToLLVMIRTranslation.cpp

@@ -308,7 +308,6 @@ static llvm::Metadata *convertModuleFlagProfileSummaryAttr(
     llvm::IRBuilderBase &builder, LLVM::ModuleTranslation &moduleTranslation) {
   llvm::LLVMContext &context = builder.getContext();
   llvm::MDBuilder mdb(context);
-  SmallVector<llvm::Metadata *> summaryNodes;
 
   auto getIntTuple = [&](StringRef key, uint64_t val) -> llvm::MDTuple * {
     SmallVector<llvm::Metadata *> tupleNodes{

mlir/lib/Transforms/RemoveDeadValues.cpp

@@ -389,8 +389,6 @@ static void processRegionBranchOp(RegionBranchOpInterface regionBranchOp,
   // the successors of `regionBranchOp`.
   auto getSuccessors = [&](Region *region = nullptr) {
     auto point = region ? region : RegionBranchPoint::parent();
-    SmallVector<Attribute> operandAttributes(regionBranchOp->getNumOperands(),
-                                             nullptr);
     SmallVector<RegionSuccessor> successors;
     regionBranchOp.getSuccessorRegions(point, successors);
     return successors;