[flang] Remove unused local variables (NFC) (#167105)

Identified with bugprone-unused-local-non-trivial-variable.

Author: kazutakahirata

flang/lib/Optimizer/CodeGen/LowerRepackArrays.cpp

@@ -289,7 +289,6 @@ PackArrayConversion::genRepackedBox(fir::FirOpBuilder &builder,
   fir::factory::genDimInfoFromBox(builder, loc, box, &lbounds, &extents,
                                   /*strides=*/nullptr);
   // Get the type parameters from the box, if needed.
-  llvm::SmallVector<mlir::Value> assumedTypeParams;
   if (numTypeParams != 0) {
     if (auto charType =
             mlir::dyn_cast<fir::CharacterType>(boxType.unwrapInnerType()))

flang/lib/Optimizer/OpenMP/DoConcurrentConversion.cpp

@@ -692,9 +692,6 @@ class DoConcurrentConversion
       if (!targetShapeCreationInfo.isShapedValue())
         return {};
 
-      llvm::SmallVector<mlir::Value> extentOperands;
-      llvm::SmallVector<mlir::Value> startIndexOperands;
-
       if (targetShapeCreationInfo.isShapeShiftedValue()) {
         llvm::SmallVector<mlir::Value> shapeShiftOperands;
 

flang/lib/Optimizer/Transforms/SimplifyIntrinsics.cpp

@@ -730,7 +730,6 @@ static void genRuntimeMinMaxlocBody(fir::FirOpBuilder &builder,
       mlir::Value ifCompatElem =
           fir::ConvertOp::create(builder, loc, ifCompatType, maskElem);
 
-      llvm::SmallVector<mlir::Type> resultsTy = {elementType, elementType};
       fir::IfOp ifOp =
           fir::IfOp::create(builder, loc, elementType, ifCompatElem,
                             /*withElseRegion=*/true);