Switch coroutine tests to release coroutines

libraries/stdlib/test/coroutines/CoroutineContextTest.kt

@@ -6,7 +6,7 @@
 package test.coroutines
 
 import kotlin.test.*
-import kotlin.coroutines.experimental.*
+import kotlin.coroutines.*
 
 class CoroutineContextTest {
     data class CtxA(val i: Int) : AbstractCoroutineContextElement(CtxA) {

libraries/stdlib/test/coroutines/CoroutinesReferenceValuesTest.kt

@@ -7,7 +7,7 @@ package test.coroutines
 
 import test.assertStaticAndRuntimeTypeIs
 import kotlin.test.*
-import kotlin.coroutines.experimental.*
+import kotlin.coroutines.*
 
 /**
  * Test to ensure that coroutine machinery does not call equals/hashCode/toString anywhere.
@@ -45,13 +45,9 @@ class CoroutinesReferenceValuesTest {
         bad.startCoroutine(object : Continuation<BadClass> {
             override val context: CoroutineContext = EmptyCoroutineContext
 
-            override fun resume(value: BadClass) {
+            override fun resumeWith(result_: SuccessOrFailure<BadClass>) {
                 assertTrue(result == null)
-                result = value
-            }
-
-            override fun resumeWithException(exception: Throwable) {
-                throw exception
+                result = result_.getOrThrow()
             }
         })
         assertTrue(result is BadClass)

libraries/stdlib/test/coroutines/SequenceBuilderTest.kt

@@ -6,8 +6,6 @@
 package test.coroutines
 
 import kotlin.test.*
-import kotlin.coroutines.experimental.buildSequence
-import kotlin.coroutines.experimental.buildIterator
 
 class SequenceBuilderTest {
     @Test