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

compiler/testData/klib/evolution/addOrRemoveConst.kt

@@ -0,0 +1,49 @@
+// MODULE: lib
+// FILE: A.kt
+// VERSION: 1
+
+val bar: String
+    get() = "a val with a getter"
+
+const val qux: String = "a const val"
+
+object X {
+    val zem: String
+        get() = "a member val with a getter"
+
+    const val spi: String = "a member const val"
+}
+
+// FILE: B.kt
+// VERSION: 2
+
+const val bar: String = "a val turned into a const"
+
+val qux: String 
+    get() = "a const turned into a val with a getter"
+
+object X {
+    val zem: String
+        get() = "a member val turned into a const"
+
+    const val spi: String = "a member const turned into a val with a getter"
+}
+
+// MODULE: mainLib(lib)
+// FILE: mainLib.kt
+
+fun lib(): String {
+    return when {
+        bar != "a val turned into a const" -> "fail 1"
+        qux != "a const turned into a val with a getter" -> "fail 2"
+        X.zem != "a member val turned into a const" -> "fail 1"
+        X.spi != "a member const turned into a val with a getter" -> "fail 2"
+
+        else -> "OK"
+    }
+}
+
+// MODULE: main(mainLib)
+// FILE: main.kt
+fun box(): String = lib()
+