branches/zip: Improve Valgrind instrumentation.

btr_cur_optimistic_insert(): On compressed tablespaces, check that both
the compressed and the uncompressed page are completely initialized in
the beginning of the function.

page_zip_compress(): After successful compression, check that the compressed
page is completely initialized.

btr/btr0cur.c

@@ -1029,6 +1029,12 @@ btr_cur_optimistic_insert(
 	page = buf_block_get_frame(block);
 	index = cursor->index;
 	zip_size = buf_block_get_zip_size(block);
+#ifdef UNIV_DEBUG_VALGRIND
+	if (zip_size) {
+		UNIV_MEM_ASSERT_RW(page, UNIV_PAGE_SIZE);
+		UNIV_MEM_ASSERT_RW(buf_block_get_page_zip(block), zip_size);
+	}
+#endif /* UNIV_DEBUG_VALGRIND */
 
 	if (!dtuple_check_typed_no_assert(entry)) {
 		fputs("InnoDB: Error in a tuple to insert into ", stderr);

page/page0zip.c

@@ -1253,6 +1253,8 @@ zlib_error:
 
 	page_zip_compress_ok[page_zip->ssize]++;
 
+	UNIV_MEM_ASSERT_RW(page_zip, page_zip_get_size(page_zip));
+
 	return(TRUE);
 }