[PL][tests] Keep PL test data under "testData/klib/" dir

compiler/testData/klib/partial-linkage/nonExhaustivenessOfWhenClause/lib1/l1.kt

@@ -0,0 +1,27 @@
+sealed interface SI1 {
+    class A : SI1
+    class B : SI1
+}
+
+sealed class SC1 {
+    class A: SC1()
+    class B: SC1()
+}
+
+enum class E1 {
+    A, B
+}
+
+enum class E2 {
+    A, B
+}
+
+sealed interface SI2 {
+    class ClassToObject : SI2
+    object ObjectToClass : SI2
+}
+
+sealed class SC2 {
+    class ClassToObject : SC2()
+    object ObjectToClass : SC2()
+}