Rename: intention tests "ifNullToElvis" --> "foldInitializerAndIfToElvis"

idea/testData/intentions/foldInitializerAndIfToElvis/ifStatementPriority.kt

@@ -0,0 +1,6 @@
+// WITH_RUNTIME
+fun test(a: String?, b: String): String {
+    val x = if (true) a else b
+    <caret>if (x == null) throw Exception()
+    return x
+}