Fix for Kotlin/kotlinx.serialization/136

Create a version that actually passes a type parameter in write$Self.
This version should take the correct type parameters from the class
rather than adding a function type parameter shared with all
serializers.

plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/resolve/KSerializerDescriptorResolver.kt

@@ -394,9 +394,13 @@ object KSerializerDescriptorResolver {
                 f.source)
         )
 
-        val kSerialClass = thisClass.getClassFromSerializationPackage("KSerializer").toSimpleType(false)
+        val kSerialClassDesc = thisClass.getClassFromSerializationPackage("KSerializer")
 
         thisClass.declaredTypeParameters.forEach {
+            val typeArgument = TypeProjectionImpl(it.defaultType)
+            val kSerialClass = KotlinTypeFactory.simpleNotNullType(Annotations.EMPTY, kSerialClassDesc, listOf(typeArgument))
+
+
             args.add(ValueParameterDescriptorImpl(
                     f,
                     null,