[K/N] Move fields from KFunctionImpl to functions

kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/KFunctionImpl.kt

@@ -9,10 +9,21 @@ import kotlin.reflect.KFunction
 import kotlin.reflect.KType
 
 @FixmeReflection
-internal abstract class KFunctionImpl<out R>(
-        override val name: String, val fqName: String, val receiver: Any?,
-        val arity: Int, val flags: Int, override val returnType: KType
-): KFunction<R> {
+internal abstract class KFunctionImpl<out R>: KFunction<R> {
+    final override val returnType get() = computeReturnType()
+    val flags get() = computeFlags()
+    val arity get() = computeArity()
+    val fqName get() = computeFqName()
+    val receiver get() = computeReceiver()
+    final override val name get() = computeName()
+
+    abstract fun computeReturnType() : KType
+    abstract fun computeFlags() : Int
+    abstract fun computeArity() : Int
+    abstract fun computeFqName() : String
+    abstract fun computeName() : String
+    open fun computeReceiver(): Any? = null
+
     override fun equals(other: Any?): Boolean {
         if (other !is KFunctionImpl<*>) return false
         return fqName == other.fqName && receiver == other.receiver

kotlin-native/runtime/src/main/kotlin/kotlin/native/internal/KSuspendFunctionImpl.kt

@@ -10,9 +10,6 @@ import kotlin.reflect.KFunction
 import kotlin.reflect.KClass
 
 @FixmeReflection
-internal abstract class KSuspendFunctionImpl<out R>(
-        name: String, fqName: String, receiver: Any?,
-        arity: Int, flags: Int, returnType: KType
-): KFunctionImpl<R>(name, fqName, receiver, arity, flags, returnType) {
+internal abstract class KSuspendFunctionImpl<out R>: KFunctionImpl<R>() {
     override fun toString() = "suspend function $name"
 }