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/box/increment/augmentedAssignmentWithComplexRhs.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 import kotlin.test.*
 
 var log = ""

compiler/testData/codegen/box/increment/memberExtOnLong.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 
 object ExtProvider {
     operator fun Long.get(i: Int) = this

compiler/testData/codegen/box/increment/mutableListElement.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 
 fun box(): String {
     val aByte = arrayListOf<Byte>(1)