Add rails for huffman table log calculation (#3047)

lib/compress/zstd_compress.c

@@ -3112,6 +3112,7 @@ static size_t ZSTD_buildBlockEntropyStats_literals(void* const src, size_t srcSi
     /* Build Huffman Tree */
     ZSTD_memset(nextHuf->CTable, 0, sizeof(nextHuf->CTable));
     huffLog = HUF_optimalTableLog(huffLog, srcSize, maxSymbolValue);
+    assert(huffLog <= LitHufLog);
     {   size_t const maxBits = HUF_buildCTable_wksp((HUF_CElt*)nextHuf->CTable, countWksp,
                                                     maxSymbolValue, huffLog,
                                                     nodeWksp, nodeWkspSize);