Moved tests

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

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

@@ -0,0 +1,11 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+tailRecursive fun Int.foo(x: Int) {
+    if (x == 0) return
+    val xx = x - 1
+    return 1 foo xx
+}
+
+fun box(): String {
+    1 foo 1000000
+    return "OK"
+}