Replace all occurrences of WITH_RUNTIME with WITH_STDLIB

We are going to deprecate `WITH_RUNTIME` directive. The main reason
behind this change is that `WITH_STDLIB` directive better describes
its meaning, specifically it will add kotlin stdlib to test's classpath.

compiler/testData/codegen/java6/box/builtinStubMethods/immutableRemove.kt

@@ -2,7 +2,7 @@
 // IGNORE_BACKEND: JS, NATIVE
 
 // FULL_JDK
-// WITH_RUNTIME
+// WITH_STDLIB
 interface ImmutableCollection<out E> : Collection<E> {
     fun add(element: @UnsafeVariance E): ImmutableCollection<E>
     fun addAll(elements: Collection<@UnsafeVariance E>): ImmutableCollection<E>