on execution I got an error:

./build/src/luajit: perf/LuaJIT-benches/sum-file.lua:11: attempt to perform arithmetic on local 'line' (a string value)

This patch adjusts the aforementioned test to use the benchmark
framework introduced before. The default arguments are adjusted
according to the <PARAM_x86.txt> file. The arguments to the script still
can be provided in the command line run.

The input for the test is redirected from the generated file
<SUMCOL_5000.txt>. This file is the result of concatenation of the
<SUMCOL_1.txt> 5000 times.
---
 perf/LuaJIT-benches/sum-file.lua | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/perf/LuaJIT-benches/sum-file.lua b/perf/LuaJIT-benches/sum-file.lua
index c9e618fd..270c1865 100644
--- a/perf/LuaJIT-benches/sum-file.lua
+++ b/perf/LuaJIT-benches/sum-file.lua
@@ -1,6 +1,25 @@
+local bench = require("bench").new(arg)
 
-local sum = 0
-for line in io.lines() do
-  sum = sum + line
-end
-io.write(sum, "\n")
+-- XXX: The input file is generated from <SUMCOL_1.txt> by
+-- repeating it 5000 times. The <SUMCOL_1.txt> contains 1000 lines
+-- with the total sum of 500.
+bench:add({
+  name = "sum_file",
+  payload = function()
+    local sum = 0
+    for line in io.lines() do
+      sum = sum + line

+    end
+    -- Allow several iterations.
+    io.stdin:seek("set", 0)
+    return sum
+  end,
+  checker = function(res)
+    -- Precomputed result.
+    return res == 2500000
+  end,
+  -- Fixed size of the file.
+  items = 5e6,
+})
+
+bench:run_and_report()