Clang-Tidy fixes

Change-Id: Ib391357fe365e2321e75b106ffac5f832abbb8fa

internal/ceres/block_jacobi_preconditioner.cc

diff --git a/internal/ceres/block_jacobi_preconditioner.cc b/internal/ceres/block_jacobi_preconditioner.cc
index 0d4ad13..8788322 100644
--- a/internal/ceres/block_jacobi_preconditioner.cc
+++ b/internal/ceres/block_jacobi_preconditioner.cc
@@ -50,7 +50,7 @@
     Preconditioner::Options options, const BlockSparseMatrix& A)
     : options_(std::move(options)) {
   m_ = std::make_unique<BlockRandomAccessDiagonalMatrix>(
-      A.block_structure()->cols, options.context, options.num_threads);
+      A.block_structure()->cols, options_.context, options_.num_threads);
 }
 
 BlockSparseJacobiPreconditioner::~BlockSparseJacobiPreconditioner() = default;

internal/ceres/schur_jacobi_preconditioner.cc

diff --git a/internal/ceres/schur_jacobi_preconditioner.cc b/internal/ceres/schur_jacobi_preconditioner.cc
index 78c51c8..018b85b 100644
--- a/internal/ceres/schur_jacobi_preconditioner.cc
+++ b/internal/ceres/schur_jacobi_preconditioner.cc
@@ -30,6 +30,7 @@
 
 #include "ceres/schur_jacobi_preconditioner.h"
 
+#include <memory>
 #include <utility>
 #include <vector>
 
@@ -60,7 +61,7 @@
   }
 
   m_ = std::make_unique<BlockRandomAccessDiagonalMatrix>(
-      blocks, options.context, options.num_threads);
+      blocks, options_.context, options_.num_threads);
   InitEliminator(bs);
 }