Add absl/log/vlog_is_on.h when using VLOG_IS_ON

Previously this header was included in absl/log/log.h
but going forward this header will not be included.

Change-Id: Ie663b221d90e32a852fb00dfe20f731dcd1dcf6b

internal/ceres/cuda_block_structure.cc

diff --git a/internal/ceres/cuda_block_structure.cc b/internal/ceres/cuda_block_structure.cc
index b5ee3a3..b1ef267 100644
--- a/internal/ceres/cuda_block_structure.cc
+++ b/internal/ceres/cuda_block_structure.cc
@@ -34,6 +34,7 @@
 
 #include "absl/log/check.h"
 #include "absl/log/log.h"
+#include "absl/log/vlog_is_on.h"
 
 namespace ceres::internal {
 namespace {

internal/ceres/dynamic_sparse_normal_cholesky_solver.cc

diff --git a/internal/ceres/dynamic_sparse_normal_cholesky_solver.cc b/internal/ceres/dynamic_sparse_normal_cholesky_solver.cc
index e66083f..7a9c549 100644
--- a/internal/ceres/dynamic_sparse_normal_cholesky_solver.cc
+++ b/internal/ceres/dynamic_sparse_normal_cholesky_solver.cc
@@ -39,6 +39,7 @@
 
 #include "Eigen/SparseCore"
 #include "absl/log/log.h"
+#include "absl/log/vlog_is_on.h"
 #include "ceres/compressed_row_sparse_matrix.h"
 #include "ceres/event_logger.h"
 #include "ceres/internal/config.h"

internal/ceres/eigensparse.cc

diff --git a/internal/ceres/eigensparse.cc b/internal/ceres/eigensparse.cc
index b037037..9e2b43e 100644
--- a/internal/ceres/eigensparse.cc
+++ b/internal/ceres/eigensparse.cc
@@ -46,6 +46,7 @@
 #include "Eigen/SparseCore"
 #include "absl/log/check.h"
 #include "absl/log/log.h"
+#include "absl/log/vlog_is_on.h"
 #include "ceres/compressed_row_sparse_matrix.h"
 #include "ceres/linear_solver.h"
 

internal/ceres/evaluator_test.cc

diff --git a/internal/ceres/evaluator_test.cc b/internal/ceres/evaluator_test.cc
index 69cea4f..2074650 100644
--- a/internal/ceres/evaluator_test.cc
+++ b/internal/ceres/evaluator_test.cc
@@ -38,6 +38,7 @@
 #include <vector>
 
 #include "absl/log/log.h"
+#include "absl/log/vlog_is_on.h"
 #include "absl/strings/str_format.h"
 #include "ceres/casts.h"
 #include "ceres/cost_function.h"

internal/ceres/event_logger.cc

diff --git a/internal/ceres/event_logger.cc b/internal/ceres/event_logger.cc
index 5fd010b..917c167 100644
--- a/internal/ceres/event_logger.cc
+++ b/internal/ceres/event_logger.cc
@@ -31,6 +31,7 @@
 #include "ceres/event_logger.h"
 
 #include "absl/log/log.h"
+#include "absl/log/vlog_is_on.h"
 #include "absl/strings/str_format.h"
 #include "absl/time/clock.h"
 #include "absl/time/time.h"

internal/ceres/suitesparse.cc

diff --git a/internal/ceres/suitesparse.cc b/internal/ceres/suitesparse.cc
index d59de88..eeb850c 100644
--- a/internal/ceres/suitesparse.cc
+++ b/internal/ceres/suitesparse.cc
@@ -39,6 +39,7 @@
 
 #include "absl/log/check.h"
 #include "absl/log/log.h"
+#include "absl/log/vlog_is_on.h"
 #include "absl/strings/str_format.h"
 #include "ceres/compressed_col_sparse_matrix_utils.h"
 #include "ceres/compressed_row_sparse_matrix.h"