Make experimental/release COROUTINE_SUSPENDED reference the same instance

It's necessary when mixing experimental/release coroutines together

 #KT-25683 In Progress

libraries/stdlib/coroutines/src/kotlin/coroutines/intrinsics/Intrinsics.kt

@@ -47,11 +47,11 @@ public suspend inline fun <T> suspendCoroutineUninterceptedOrReturn(crossinline
 // It is implemented as property with getter to avoid ProGuard <clinit> problem with multifile IntrinsicsKt class
 @SinceKotlin("1.3")
 public val COROUTINE_SUSPENDED: Any
-    get() = CoroutineSingletons.COROUTINE_SUSPENDED
+    get() = kotlin.coroutines.experimental.intrinsics.COROUTINE_SUSPENDED
 
 // Using enum here ensures two important properties:
 //  1. It makes SafeContinuation serializable with all kinds of serialization frameworks (since all of them natively support enums)
 //  2. It improves debugging experience, since you clearly see toString() value of those objects and what package they come from
 @SinceKotlin("1.3")
 @PublishedApi // This class is Published API via serialized representation of SafeContinuation, don't rename/move
-internal enum class CoroutineSingletons { COROUTINE_SUSPENDED, UNDECIDED, RESUMED }
+internal enum class CoroutineSingletons { UNDECIDED, RESUMED }