NFC: Address a couple of unused variable warnings.

Author: tshortli

lib/ClangImporter/ImportDecl.cpp

@@ -3381,13 +3381,6 @@ namespace {
                    d->getName() == "cos" || d->getName() == "exit";
           return false;
         };
-        auto topLevelModuleEq =
-            [](const clang::FunctionDecl *d, StringRef n) -> bool {
-          return d->getOwningModule() &&
-                 d->getOwningModule()
-                    ->getTopLevelModule()
-                    ->getFullModuleName() == n;
-        };
 
         if (clang::Module *owningModule = decl->getOwningModule();
             owningModule && importer::isCxxStdModule(owningModule)) {

lib/SILOptimizer/Mandatory/MoveOnlyBorrowToDestructureUtils.cpp

@@ -1690,7 +1690,6 @@ bool BorrowToDestructureTransform::transform() {
   auto *fn = mmci->getFunction();
   LLVM_DEBUG(llvm::dbgs() << "Performing Borrow To Destructure Transform!\n";
              fn->print(llvm::dbgs()));
-  auto &C = fn->getASTContext();
   StackList<BeginBorrowInst *> borrowWorklist(mmci->getFunction());
 
   // If we failed to gather borrows due to the transform not understanding part