Performance optimization in completion: search context variables of functional types later

idea/idea-completion/testData/basic/common/highOrderFunctions/ContextVariables3.kt

@@ -0,0 +1,12 @@
+class C {
+    companion object {
+        fun create(p: (Int) -> Unit) = C()
+    }
+}
+
+val handler: (Int) -> Unit = {}
+
+fun v: C = cr<caret>
+
+// EXIST: { allLookupStrings: "C, create", itemText: "C.create", tailText: " {...} (p: (Int) -> Unit) (<root>)", typeText:"C" }
+// EXIST: { allLookupStrings: "C, create", itemText: "C.create", tailText: "(handler) (<root>)", typeText:"C" }