Added ifThenToElvisIntention

idea/testData/intentions/branched/ifThenToElvis/doesNotinlineValueOutsideOfScope.kt.after

@@ -0,0 +1,9 @@
+fun maybeFoo(): String? {
+    return "foo"
+}
+
+val x = maybeFoo()
+
+fun main(args: Array<String>) {
+    x ?: "abc"
+}