Moved tests

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

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

@@ -0,0 +1,21 @@
+tailRecursive fun test(x : Int) : Unit {
+    if (x == 1) {
+        test(x - 1)
+    } else if (x == 2) {
+        test(x - 1)
+        return
+    } else if (x == 3) {
+        <!NON_TAIL_RECURSIVE_CALL!>test<!>(x - 1)
+        if (x == 3) {
+            test(x - 1)
+        }
+        return
+    } else if (x > 0) {
+        test(x - 1)
+    }
+}
+
+fun box() : String {
+    test(1000000)
+    return "OK"
+}