KT-3978: Kotlin: [Internal Error] org.jetbrains.jet.codegen.CompilationException: Back-end (JVM) Internal error: null

#KT-3978 Fixed

compiler/testData/codegen/box/functions/localFunctions/kt3978.kt

@@ -0,0 +1,10 @@
+fun box() : String {
+
+
+    fun local(i: Int = 1) : Int {
+        return i
+    }
+
+    return if (local() != 1) "fail" else "OK"
+}
+

compiler/testData/codegen/box/functions/localFunctions/localWithDefault.kt

@@ -0,0 +1,8 @@
+class Z {}
+
+fun box(): String {
+    fun  Z.plus(s : String, d : String = "K") : String {
+        return s + d
+    }
+    return Z() + "O"
+}