Minor, make KCallableImpl a class

This will allow to cache stuff common to all callables in KCallableImpl

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KCallableImpl.kt

@@ -24,14 +24,14 @@ import java.util.*
 import kotlin.reflect.*
 import kotlin.reflect.jvm.javaType
 
-internal interface KCallableImpl<out R> : KCallable<R>, KAnnotatedElementImpl {
-    val descriptor: CallableMemberDescriptor
+internal abstract class KCallableImpl<out R> : KCallable<R>, KAnnotatedElementImpl {
+    abstract val descriptor: CallableMemberDescriptor
 
-    val caller: FunctionCaller<*>
+    abstract val caller: FunctionCaller<*>
 
-    val defaultCaller: FunctionCaller<*>?
+    abstract val defaultCaller: FunctionCaller<*>?
 
-    val container: KDeclarationContainerImpl
+    abstract val container: KDeclarationContainerImpl
 
     override val annotated: Annotated get() = descriptor
 

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KFunctionImpl.kt

@@ -33,7 +33,7 @@ internal class KFunctionImpl private constructor(
         name: String,
         private val signature: String,
         descriptorInitialValue: FunctionDescriptor?
-) : KFunction<Any?>, KCallableImpl<Any?>, FunctionImpl, FunctionWithAllInvokes {
+) : KCallableImpl<Any?>(), KFunction<Any?>, FunctionImpl, FunctionWithAllInvokes {
     constructor(container: KDeclarationContainerImpl, name: String, signature: String) : this(container, name, signature, null)
 
     constructor(container: KDeclarationContainerImpl, descriptor: FunctionDescriptor) : this(

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KPropertyImpl.kt

@@ -36,7 +36,7 @@ internal abstract class KPropertyImpl<out R> private constructor(
         override val name: String,
         val signature: String,
         descriptorInitialValue: PropertyDescriptor?
-) : KProperty<R>, KCallableImpl<R> {
+) : KCallableImpl<R>(), KProperty<R> {
     constructor(container: KDeclarationContainerImpl, name: String, signature: String) : this(
             container, name, signature, null
     )
@@ -105,7 +105,7 @@ internal abstract class KPropertyImpl<out R> private constructor(
             ReflectionObjectRenderer.renderProperty(descriptor)
 
     abstract class Accessor<out PropertyType, out ReturnType> :
-            KCallableImpl<ReturnType>, KProperty.Accessor<PropertyType>, KFunction<ReturnType> {
+            KCallableImpl<ReturnType>(), KProperty.Accessor<PropertyType>, KFunction<ReturnType> {
         abstract override val property: KPropertyImpl<PropertyType>
 
         abstract override val descriptor: PropertyAccessorDescriptor