[codegen][Build] it's more readable to move the if condition out of the loop (#4501)

src/codegen/codegen.cc

@@ -41,8 +41,8 @@ runtime::Module Build(const Array<LoweredFunc>& funcs,
     mode = mode.substr(0, pos);
   }
   Array<LoweredFunc> transformed_funcs;
-  for (const auto& x : funcs) {
   if (BuildConfig::Current()->disable_assert) {
+    for (const auto& x : funcs) {
       auto func = ir::SkipAssert(x);
       transformed_funcs.push_back(func);
     }