Introduce "Redundant else in if" inspection #KT-19668 Fixed

idea/testData/inspectionsLocal/redundantElseInIf/redundantSingleLine2.kt

@@ -0,0 +1,11 @@
+// WITH_RUNTIME
+class SomeException : RuntimeException()
+fun foo(): Int = 1
+
+fun test(x: Int): Int {
+    if (x == 1) {
+        throw SomeException()
+    } else if (x == 2) {
+        throw SomeException()
+    } <caret>else return foo()
+}