suite passes now with mcode->mach lowering

internal/bootstrap.cm

@@ -1,5 +1,5 @@
 // Hidden vars come from env:
-//   CLI mode (cell_init):       os, args, core_path, shop_path, emit_qbe
+//   CLI mode (cell_init):       os, args, core_path, shop_path, emit_qbe, dump_mach
 //   Actor spawn (script_startup): os, json, nota, wota, actorsym, init, core_path, shop_path
 // args[0] = script name, args[1..] = user args
 var load_internal = os.load_internal
@@ -165,6 +165,10 @@ function run_ast(name, ast, env) {
     print(qbe_il)
     return null
   }
+  if (dump_mach) {
+    mach_dump_mcode(name, json.encode(optimized), env)
+    return null
+  }
   return mach_eval_mcode(name, json.encode(optimized), env)
 }