testbed is now functional

I would like to make sure some _ tests are
passing, however I have to think of a nice
way to grab debug output and compare it
nicely.  Some require NReg == 3, that is a
pain in the ass.  Maybe they can be changed
to work for the full register set.

lisc/test/echo.ssa

@@ -26,3 +26,7 @@ function w $main(w %argc, l %argv) {
 @end
 	ret 0
 }
+
+# >>> output
+# a b c
+# <<<