The intention of this code was to use the name "kotlin" for the builtins
module, in case we're using builtins loaded from the compiler class
loader (whose module is created in
`KotlinBuiltIns.createBuiltInsModule`). However,
`getBuiltIns().getBuiltInsModule()` may refer not necessarily to the
builtins module, but also to any valid module where the builtins are
visible from, therefore its name would be computed incorrectly. Use the
module name instead to determine if it's a synthetic builtins module
created in `createBuiltInsModule`
Alexander Udalov
0659d0cba9