Currently FirThisReceiverExpression of instance methods are translated
to references of the class' thisReceiver,
not the method's dispatch receiver,
which causes problems with IrFrameMap::typeOf,
as the class' thisReceiver is not in the typeMap.
This commit translates non-qualified "this" references of
instance methods to references of the methods' dispatch receiver.
The problem was that for property getter 'context.getContextDescriptor()'
references the containing property, while 'context.getFunctionDescriptor()'
the accessor itself
#KT-15594 Fixed