This doesn't reduce the quality of tests, because the flags are still
printed for declarations themselves. We only omit them in references.
However, this makes the tests more compatible with non-JVM backends
(see KT-58605), because flags of referenced stdlib declarations may
differ among target platforms.
Refactor the renderer, make BoundSymbolReferenceRenderer a static class
to prevent calling RenderIrElementVisitor's methods from it to avoid
infinite recursion in the future.
^KT-52677 Fixed