Use page_is_leaf() where applicable

storage/innobase/btr/btr0btr.cc

@@ -3241,7 +3241,7 @@ btr_page_split_and_insert(
 	btr_page_create(new_block, new_page_zip, cursor->index,
 			btr_page_get_level(page, mtr), mtr);
 	/* Only record the leaf level page splits. */
-	if (btr_page_get_level(page, mtr) == 0) {
+	if (page_is_leaf(page)) {
 		cursor->index->stat_defrag_n_page_split ++;
 		cursor->index->stat_defrag_modified_counter ++;
 		btr_defragment_save_defrag_stats_if_needed(cursor->index);

storage/innobase/btr/btr0defragment.cc

@@ -233,7 +233,7 @@ btr_defragment_add_index(
 		return NULL;
 	}
 
-	if (btr_page_get_level(page, &mtr) == 0) {
+	if (page_is_leaf(page)) {
 		// Index root is a leaf page, no need to defragment.
 		mtr_commit(&mtr);
 		return NULL;

storage/innobase/dict/dict0stats.cc

@@ -1576,7 +1576,7 @@ dict_stats_analyze_index_below_cur(
 
 		page = buf_block_get_frame(block);
 
-		if (btr_page_get_level(page, mtr) == 0) {
+		if (page_is_leaf(page)) {
 			/* leaf level */
 			break;
 		}
@@ -1620,7 +1620,7 @@ dict_stats_analyze_index_below_cur(
 	}
 
 	/* make sure we got a leaf page as a result from the above loop */
-	ut_ad(btr_page_get_level(page, &mtr) == 0);
+	ut_ad(page_is_leaf(page));
 
 	/* scan the leaf page and find the number of distinct keys,
 	when looking only at the first n_prefix columns; also estimate

storage/xtradb/btr/btr0btr.cc

@@ -3277,7 +3277,7 @@ btr_page_split_and_insert(
 	btr_page_create(new_block, new_page_zip, cursor->index,
 			btr_page_get_level(page, mtr), mtr);
 	/* Only record the leaf level page splits. */
-	if (btr_page_get_level(page, mtr) == 0) {
+	if (page_is_leaf(page)) {
 		cursor->index->stat_defrag_n_page_split ++;
 		cursor->index->stat_defrag_modified_counter ++;
 		btr_defragment_save_defrag_stats_if_needed(cursor->index);

storage/xtradb/btr/btr0defragment.cc

@@ -233,7 +233,7 @@ btr_defragment_add_index(
 		return NULL;
 	}
 
-	if (btr_page_get_level(page, &mtr) == 0) {
+	if (page_is_leaf(page)) {
 		// Index root is a leaf page, no need to defragment.
 		mtr_commit(&mtr);
 		return NULL;

storage/xtradb/dict/dict0stats.cc

@@ -1576,7 +1576,7 @@ dict_stats_analyze_index_below_cur(
 
 		page = buf_block_get_frame(block);
 
-		if (btr_page_get_level(page, mtr) == 0) {
+		if (page_is_leaf(page)) {
 			/* leaf level */
 			break;
 		}
@@ -1620,7 +1620,7 @@ dict_stats_analyze_index_below_cur(
 	}
 
 	/* make sure we got a leaf page as a result from the above loop */
-	ut_ad(btr_page_get_level(page, &mtr) == 0);
+	ut_ad(page_is_leaf(page));
 
 	/* scan the leaf page and find the number of distinct keys,
 	when looking only at the first n_prefix columns; also estimate