Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/when/enumOptimization/subjectAny.kt

@@ -0,0 +1,28 @@
+// WITH_RUNTIME
+
+import kotlin.test.assertEquals
+
+enum class Season {
+    WINTER,
+    SPRING,
+    SUMMER,
+    AUTUMN
+}
+
+fun foo(x : Any) : String {
+    return when (x) {
+        Season.WINTER -> "winter"
+        Season.SPRING -> "spring"
+        Season.SUMMER -> "summer"
+        else -> "other"
+    }
+}
+
+fun box() : String {
+    assertEquals("winter", foo(Season.WINTER))
+    assertEquals("spring", foo(Season.SPRING))
+    assertEquals("summer", foo(Season.SUMMER))
+    assertEquals("other", foo(Season.AUTUMN))
+    assertEquals("other", foo(123))
+    return "OK"
+}