Get rid of module() in all internal modules.

src/jit/v.lua

@@ -159,9 +159,9 @@ local function dumpon(outfile)
 end
 
 -- Public module functions.
-module(...)
-
-on = dumpon
-off = dumpoff
-start = dumpon -- For -j command line option.
+return {
+  on = dumpon,
+  off = dumpoff,
+  start = dumpon -- For -j command line option.
+}