Add test for obsolete KT-17431 issue

#KT-17431 Obsolete

compiler/testData/codegen/boxInline/simple/kt17431.kt

@@ -0,0 +1,36 @@
+// WITH_RUNTIME
+// FILE: 1.kt
+package test
+
+class WeakReference<T>(val value: T)
+
+inline fun <K, V> MutableMap<K, WeakReference<V>>.getOrPutWeak(key: K, defaultValue: ()->V): V {
+    val value = get(key)?.value
+    return if (value == null) {
+        val answer = defaultValue()
+        put(key, WeakReference(answer))
+        answer
+    } else {
+        value
+    }
+}
+
+
+// FILE: 2.kt
+import test.*
+
+class LabelHolder {
+
+    fun test(): String {
+        return "hello".label
+    }
+
+    private val labels = hashMapOf<String?, WeakReference<String>>()
+
+    private val String?.label: String
+        get(): String = labels.getOrPutWeak(this) { "OK" }
+}
+
+fun box(): String {
+    return LabelHolder().test()
+}