Support local function references in codegen

#KT-3704 In Progress
 #KT-1183 In Progress

compiler/testData/codegen/box/callableReference/local/localLocal.kt

@@ -0,0 +1,10 @@
+fun box(): String {
+    fun foo(): String {
+        fun bar() = "OK"
+        val ref = ::bar
+        return ref()
+    }
+
+    val ref = ::foo
+    return ref()
+}