Moved tests

that are used both for codegen & diagnostics to codegen/box/diagnostics

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

@@ -0,0 +1,23 @@
+class A {
+    tailRecursive fun f1(c : Int) {
+        if (c > 0) {
+            this.f1(c - 1)
+        }
+    }
+
+    tailRecursive fun f2(c : Int) {
+        if (c > 0) {
+            f2(c - 1)
+        }
+    }
+
+    <!NO_TAIL_CALLS_FOUND!>tailRecursive fun f3(a : A)<!> {
+        a.<!NON_TAIL_RECURSIVE_CALL!>f3<!>(a) // non-tail recursion, could be potentially resolved by condition if (a == this) f3() else a.f3()
+    }
+}
+
+fun box() : String {
+    A().f1(1000000)
+    A().f2(1000000)
+    return "OK"
+}