Get reified signature from JetTypeMapper

#KT-6485 Fixed

compiler/testData/codegen/boxWithStdlib/reified/kt6485.kt

@@ -0,0 +1,19 @@
+import kotlin.test.assertEquals
+import java.lang.reflect.ParameterizedType
+import java.lang.reflect.Type
+
+open class TypeLiteral<T> {
+    val type: Type
+        get() = (javaClass.getGenericSuperclass() as ParameterizedType).getActualTypeArguments()[0]
+}
+
+inline fun <reified T> typeLiteral(): TypeLiteral<T> = object : TypeLiteral<T>() {}
+
+fun box(): String {
+    assertEquals("class java.lang.String", typeLiteral<String>().type.toString())
+    assertEquals("java.util.List<?>", typeLiteral<List<*>>().type.toString())
+    assertEquals("java.lang.String[]", typeLiteral<Array<String>>().type.toString())
+    assertEquals("java.lang.Integer[]", typeLiteral<Array<Int>>().type.toString())
+    assertEquals("java.lang.String[][]", typeLiteral<Array<Array<String>>>().type.toString())
+    return "OK"
+}