Rename directory for back-end tests

compiler/testData/codegen/box/functions/tailRecursion/thisReferences.kt

@@ -0,0 +1,23 @@
+class A {
+    tailRecursive fun f1(c : Int, x : Any) {
+        if (c > 0) {
+            this.f1(c - 1, "tail")
+        }
+    }
+
+    tailRecursive fun f2(c : Int, x : Any) {
+        if (c > 0) {
+            f2(c - 1, "tail 108")
+        }
+    }
+
+    tailRecursive fun f3(a : A, x : Any) {
+        a.f3(a, "no tail") // non-tail recursion, could be potentially resolved by condition if (a == this) f3() else a.f3()
+    }
+}
+
+fun box() : String {
+    A().f1(1000000, "test")
+    A().f2(1000000, "test")
+    return "OK"
+}