JVM_IR KT-47739 recognize fake override external stubs

compiler/testData/codegen/box/jvmField/kt47739.kt

@@ -0,0 +1,32 @@
+// TARGET_BACKEND: JVM
+// WITH_RUNTIME
+
+// MODULE: lib
+// FILE: Value.kt
+package vv
+
+sealed class Value<T>(@JvmField val value: T) {
+    class StringValue(value: String) : Value<String>(value)
+    class BooleanValue(value: Boolean): Value<Boolean>(value)
+}
+
+
+// MODULE: main(lib)
+// FILE: kt47739.kt
+import kotlin.test.*
+import vv.*
+
+fun test(v: Value<*>) {
+    when (v) {
+        is Value.StringValue ->
+            assertEquals("a string", v.value)
+        is Value.BooleanValue ->
+            assertEquals(true, v.value)
+    }
+}
+
+fun box(): String {
+    test(Value.StringValue("a string"))
+    test(Value.BooleanValue(true))
+    return "OK"
+}