New Intention Action: Invert If Condition

Inverts the conditional expression in an if expression.

idea/testData/intentions/invertIfCondition/forLoopWithMultipleExpressions.kt

@@ -0,0 +1,11 @@
+// WITH_RUNTIME
+fun main() {
+    val list = 1..4
+
+    for (x in list) {
+        <caret>if (x == 2) {
+            list
+        }
+        list.equals(list)
+    }
+}