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

compiler/testData/klib/evolution/moreSpecificBaseClass.kt

@@ -0,0 +1,36 @@
+// MODULE: base
+// FILE: base.kt
+
+open class X {
+    open val bar: String = "base class"
+}
+
+open class Y: X() {
+    override val bar: String = "child class"
+}
+
+// MODULE: lib(base)
+// FILE: A.kt
+// VERSION: 1
+
+class Z : X() 
+
+// FILE: B.kt
+// VERSION: 2
+
+class Z : Y() 
+
+// MODULE: mainLib(lib)
+// FILE: mainLib.kt
+
+fun lib(): String {
+    return when {
+        Z().bar != "child class" -> "fail 1"
+        else -> "OK"
+    }
+}
+
+// MODULE: main(mainLib)
+// FILE: main.kt
+fun box(): String = lib()
+