Refactoring: make "if-then to safe access" an inspection

idea/testData/inspectionsLocal/branched/ifThenToSafeAccess/blockUsesDifferentVar.kt

@@ -0,0 +1,9 @@
+// PROBLEM: none
+fun main(args: Array<String>) {
+    var foo: String? = "foo"
+    var bar: String? = "bar"
+    if (foo != null<caret>) {
+        bar?.length
+    }
+    else null
+}