[Compatibility] Restore old TargetPlatform and subtypes for compatibility

compiler/frontend.common/src/org/jetbrains/kotlin/resolve/TargetPlatform.kt

@@ -0,0 +1,15 @@
+/*
+ * Copyright 2010-2018 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.resolve
+
+@Deprecated(
+    message = "This class is deprecated and will be removed soon, use API from 'org.jetbrains.kotlin.platform.*' packages instead",
+    replaceWith = ReplaceWith("TargetPlatform", "org.jetbrains.kotlin.platform.TargetPlatform"),
+    level = DeprecationLevel.ERROR
+)
+interface TargetPlatform {
+    val platformName: String
+}