Moved tests

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

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

@@ -0,0 +1,10 @@
+tailRecursive fun test(counter : Int) : Int? {
+    if (counter < 0) return null
+    if (counter == 0) return 777
+
+    return <!NON_TAIL_RECURSIVE_CALL!>test<!>(-1) ?: <!NON_TAIL_RECURSIVE_CALL!>test<!>(-2) ?: test(counter - 1)
+}
+
+fun box() : String =
+    if (test(100000) == 777) "OK"
+    else "FAIL"