Allow data classes to inherit from other classes

#KT-10330 Fixed

compiler/testData/diagnostics/tests/sourceCompatibility/noDataClassInheritance.kt

@@ -0,0 +1,13 @@
+// !LANGUAGE: -DataClassInheritance
+
+interface Allowed
+
+open class NotAllowed
+
+<!INCOMPATIBLE_MODIFIERS!>abstract<!> <!INCOMPATIBLE_MODIFIERS!>data<!> class Base(val x: Int)
+
+class Derived: Base(42)
+
+<!DATA_CLASS_OVERRIDE_CONFLICT!>data<!> class Nasty(val z: Int, val y: Int): <!DATA_CLASS_CANNOT_HAVE_CLASS_SUPERTYPES!>Base<!>(z)
+
+data class Complex(val y: Int): Allowed, <!DATA_CLASS_CANNOT_HAVE_CLASS_SUPERTYPES!>NotAllowed<!>()