[Metadata] Add platform dependent type transformer

- Fix forward declaration type construction

core/descriptors/src/org/jetbrains/kotlin/descriptors/deserialization/PlatformDependentTypeTransformer.kt

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.descriptors.deserialization
+
+import org.jetbrains.kotlin.name.ClassId
+import org.jetbrains.kotlin.types.SimpleType
+
+interface PlatformDependentTypeTransformer {
+    fun transformPlatformType(classId: ClassId, computedType: SimpleType): SimpleType
+
+    object None : PlatformDependentTypeTransformer {
+        override fun transformPlatformType(classId: ClassId, computedType: SimpleType): SimpleType = computedType
+    }
+}