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

compiler/testData/klib/partial-linkage/removeAbstractCallableFromAbstractClassOrInterface/lib2/l2.kt

@@ -0,0 +1,13 @@
+package lib2
+
+import lib1.*
+
+class AbstractClassImpl : AbstractClass() {
+    override fun foo() = 42
+    override val bar = 42
+}
+
+class InterfaceImpl : Interface {
+    override fun foo() = 42
+    override val bar = 42
+}

compiler/testData/klib/partial-linkage/removeAbstractCallableFromAbstractClassOrInterface/lib2/l2.kt.1

@@ -0,0 +1,6 @@
+package lib2
+
+import lib1.*
+
+class AbstractClassImpl : AbstractClass()
+class InterfaceImpl : Interface

compiler/testData/klib/partial-linkage/removeAbstractCallableFromAbstractClassOrInterface/lib2/module.info

@@ -0,0 +1,6 @@
+STEP 0:
+    dependencies: stdlib, lib1
+STEP 1:
+    dependencies: stdlib, lib1
+    modifications:
+        U : l2.kt.1 -> l2.kt