Missing tests added

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

@@ -0,0 +1,8 @@
+tailRecursive fun Int.test(x : Int) : Int {
+    if (this > 1) {
+        return (this - 1) test x
+    }
+    return this
+}
+
+fun box() : String = if (1000000.test(1000000) == 1) "OK" else "FAIL"

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

@@ -0,0 +1,12 @@
+tailRecursive fun test(x : Int) : Int {
+    return if (x == 1) {
+        <!NON_TAIL_RECURSIVE_CALL!>test<!>(x - 1)
+        1 + <!NON_TAIL_RECURSIVE_CALL!>test<!>(x - 1)
+    } else if (x > 0) {
+        test(x - 1)
+    } else {
+        0
+    }
+}
+
+fun box() : String = if (test(1000000) == 1) "OK" else "FAIL"