Zlib replace saved stream with restart

--- a/ext/compressors/zlib/zlib_compress.c

+++ b/ext/compressors/zlib/zlib_compress.c

@@ -236,7 +236,7 @@ zlib_compress_raw(WT_COMPRESSOR *compressor, WT_SESSION *session,

        ZLIB_OPAQUE opaque;

        z_stream zs;

        uint32_t curr_slot, last_slot;

-       int ret;

+       int ret, rbcnt;

        curr_slot = last_slot = 0;

        (void)split_pct;

@@ -277,6 +277,7 @@ zlib_compress_raw(WT_COMPRESSOR *compressor, WT_SESSION *session,

         * page results in forced eviction based on in-memory size, even though

         * the data fits into a single on-disk block.

         */

+       rbcnt = 1;

        while (zs.avail_out > 0 && zs.total_in <= zs.total_out * 20) {

                /* Find the slot we will try to compress up to. */

                if ((curr_slot = zlib_find_slot(

@@ -290,7 +291,7 @@ zlib_compress_raw(WT_COMPRESSOR *compressor, WT_SESSION *session,

                                    compressor, session, "deflate", ret));

                /* Roll back if the last deflate didn't complete. */

-               if (zs.avail_in > 0)

+               if (zs.avail_in > 0 || ++rbcnt > 10)

                        goto rollback;

                last_slot = curr_slot;

@@ -341,7 +342,7 @@ rollback:   if ((ret = deflateReset(&zs)) != Z_OK)

                *result_lenp = 1;

        }

-#if 0

+#if 1

        /* Decompress the result and confirm it matches the original source. */

        if (last_slot > 0) {

                void *decomp;