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

compiler/testData/klib/evolution/changePropertyFromValToVar.kt

@@ -0,0 +1,48 @@
+// MODULE: lib
+// FILE: A.kt
+// VERSION: 1
+
+val bar = "global val initialization value"
+
+class X {
+    val qux = "member val initialization value"
+}
+
+fun foo(x: X) {
+    // DO NOTHING
+}
+
+// FILE: B.kt
+// VERSION: 2
+
+var bar = "global var initialization value"
+
+class X {
+    var qux = "member var initialization value"
+}
+
+fun foo(x: X) {
+    bar = "changed global value"
+    x.qux = "changed member value"
+    
+}
+
+
+// MODULE: mainLib(lib)
+// FILE: mainLib.kt
+fun lib(): String {
+    val x = X()
+    foo(x)
+
+    return when {
+        bar != "changed global value" -> "fail 1"
+        x.qux != "changed member value" -> "fail 2"
+
+        else -> "OK"
+    }
+}
+
+// MODULE: main(mainLib)
+// FILE: main.kt
+fun box(): String = lib()
+