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/boxModernJdk/testsWithJava11/varHandle.kt

@@ -1,7 +1,7 @@
 // !LANGUAGE: +PolymorphicSignature
 // TARGET_BACKEND: JVM
 // SKIP_JDK6
-// WITH_RUNTIME
+// WITH_STDLIB
 
 import java.lang.invoke.MethodHandles
 import kotlin.concurrent.thread