J2K: generating of elvis operators instead of if's

j2k/testData/fileOrElement/codeSimplifications/IfToElvis.java

@@ -0,0 +1,5 @@
+class C {
+    String foo(String s) {
+        return s != null ? s : "";
+    }
+}

j2k/testData/fileOrElement/codeSimplifications/IfToElvis.kt

@@ -0,0 +1,5 @@
+class C {
+    fun foo(s: String?): String {
+        return s ?: ""
+    }
+}