Scalac in some location(assigns for example) assumes that tree is a Select.
In dotty it could also be an Ident.
Simulate this.
Fixes scala#477

It is known to return an actual Select.

Common interface with scalac tries not to load it it wasn't loaded already.
We need it.

This update allows to have non-static lambdas.
It doesn't mean that we should emit such,
as they are potential memory leak. See scala#480
Fixes scala#470

…h are InSuperCall.