branches/zip: Remove a bogus page_zip_validate() assertion failure found

by running index_merge_ror_cpk on 1-kilobyte compressed pages.

page_delete_rec_list_start(): Remove the page_zip_validate() assertion.

btr_page_split_and_insert(): Add page_zip_validate() assertions about
page and new_page after moving the records.

btr/btr0btr.c

@@ -1858,6 +1858,13 @@ btr_page_split_and_insert(
 		lock_update_split_right(right_page, left_page);
 	}
 
+#ifdef UNIV_ZIP_DEBUG
+	if (UNIV_LIKELY_NULL(page_zip)) {
+		ut_a(page_zip_validate(page_zip, page));
+		ut_a(page_zip_validate(new_page_zip, new_page));
+	}
+#endif /* UNIV_ZIP_DEBUG */
+
 	/* At this point, split_rec, move_limit and first_rec may point
 	to garbage on the old page. */
 

page/page0page.c

@@ -1040,10 +1040,10 @@ page_delete_rec_list_start(
 
 	ut_ad((ibool) !!page_rec_is_comp(rec)
 			== dict_table_is_comp(index->table));
-#ifdef UNIV_ZIP_DEBUG
-	ut_a(!page_zip || page_zip_validate(page_zip,
-			ut_align_down(rec, UNIV_PAGE_SIZE)));
-#endif /* UNIV_ZIP_DEBUG */
+	/* page_zip_validate() would detect a min_rec_mark mismatch
+	in btr_page_split_and_insert()
+	between btr_attach_half_pages() and insert_page = ...
+	when btr_page_get_split_rec_to_left() holds (direction == FSP_DOWN). */
 
 	if (page_rec_is_infimum(rec)) {