Test for not reproduced KT-2700

 #KT-2700 Can't Reproduce
Synthetic accessors for class object private members

 #KT-3338 Fixed
Realization of class object fields as static fields of outer class

 #KT-2213 Fixed
Test for static
CodegenContext replaced with MethodContext in ExpressionCodegen
Rename fields on name clashing

 #KT-3663 Fixed
 #KT-3664 Fixed
Tests for renamed fields