Serialization of flexible types supported

compiler/testData/loadJava/compiledKotlin/type/platform.kt

@@ -0,0 +1,8 @@
+//ALLOW_AST_ACCESS
+package test
+
+import java.util.*
+
+fun printStream() = System.out
+fun list() = Collections.emptyList<String>()
+fun array(a: Array<Int>) = Arrays.copyOf(a, 2)

compiler/testData/loadJava/compiledKotlin/type/platform.txt

@@ -0,0 +1,5 @@
+package test
+
+internal fun array(/*0*/ a: kotlin.Array<kotlin.Int>): kotlin.Array<(out) kotlin.Int!>!
+internal fun list(): kotlin.(Mutable)List<kotlin.String!>!
+internal fun printStream(): java.io.PrintStream!