Use it to check that only the value parameters that are explicitly
marked assignable are assigned.
Currently, the only parameters marked assignable are those for
default argument stubs.
This is a follow-up to b497f39c29. It
turns out that it didn't help because `IrFunction.returnType` throws
exception, and checking for `IrUninitializedType` in `IrType.render` was
already too late. Throw and catch specific exception instead.
Also add function name into the exception message for better diagnostics
elsewhere (can't compute the full FQ name because in cases like
KT-42020, the parent is also uninitialized).
For IrProperty, IrSimpleFunction we need to pass information about
original declaration to JVM_IR codegen. Instead of descriptors, use
the attributeOwnerId field.
Unfortunately this requires a lot of boilerplate, but is a requirement
for transforming the main IR element hierarchy interfaces
(IrDeclaration, IrClass, ...) to classes.
This will help to reduce boilerplate after making the latter classes.
Without this change, IrFunctionCommonImpl would not be able to be a
class because it would introduce a diamond class hierarchy, and thus
that would require copying all its contents to IrFunctionImpl and
IrFakeOverrideFunctionImpl.
Svyatoslav Kuzmich