Add 'not linked' kind of spec tests

compiler/tests-spec/testData/diagnostics/helpers/sealedClasses.kt

@@ -0,0 +1,36 @@
+sealed class _SealedClass
+data class _SealedChild1(val number: Int) : _SealedClass()
+data class _SealedChild2(val e1: Int, val e2: Int) : _SealedClass()
+data class _SealedChild3(val m1: Int, val m2: Int) : _SealedClass()
+
+sealed class _SealedClassWithObjects
+object _SealedWithObjectsChild1 : _SealedClassWithObjects()
+object _SealedWithObjectsChild2 : _SealedClassWithObjects()
+object _SealedWithObjectsChild3 : _SealedClassWithObjects()
+
+sealed class _SealedClassSingle
+data class _SealedSingleChild1(val number: Int) : _SealedClassSingle()
+
+sealed class _SealedClassSingleWithObject
+object _SealedSingleWithObjectChild1: Expr3() {}
+
+sealed class _SealedClassEmpty
+
+sealed class _SealedClassWithMethods
+class _SealedWithMethodsChild1() : _SealedClassWithMethods() {
+    fun m1() = this.hashCode().toString()
+}
+class _SealedWithMethodsChild2() : _SealedClassWithMethods() {
+    fun m2() = this.hashCode().toString()
+}
+class _SealedWithMethodsChild3() : _SealedClassWithMethods() {
+    fun m3() = this.hashCode().toString()
+}
+
+sealed class _SealedClassMixed
+data class _SealedMixedChild1(val number: Int) : _SealedClassMixed()
+data class _SealedMixedChild2(val e1: Int, val e2: Int) : _SealedClassMixed()
+data class _SealedMixedChild3(val m1: Int, val m2: Int) : _SealedClassMixed()
+object _SealedMixedChildObject1 : _SealedClassMixed()
+object _SealedMixedChildObject2 : _SealedClassMixed()
+object _SealedMixedChildObject3 : _SealedClassMixed()