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/casts/mutableCollections/asWithMutable.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 
 
 class Itr : Iterator<String> by ArrayList<String>().iterator()

compiler/testData/codegen/box/casts/mutableCollections/isWithMutable.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 
 class Itr : Iterator<String> by ArrayList<String>().iterator()
 class MItr : MutableIterator<String> by ArrayList<String>().iterator()

compiler/testData/codegen/box/casts/mutableCollections/mutabilityMarkerInterfaces.kt

@@ -1,6 +1,6 @@
 // TARGET_BACKEND: JVM
 
-// WITH_RUNTIME
+// WITH_STDLIB
 
 abstract class Itr : Iterator<String>
 abstract class MItr : MutableIterator<String>

compiler/testData/codegen/box/casts/mutableCollections/reifiedAsWithMutable.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 
 
 class Itr : Iterator<String> by ArrayList<String>().iterator()

compiler/testData/codegen/box/casts/mutableCollections/reifiedIsWithMutable.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 
 class Itr : Iterator<String> by ArrayList<String>().iterator()
 class MItr : MutableIterator<String> by ArrayList<String>().iterator()

compiler/testData/codegen/box/casts/mutableCollections/reifiedSafeAsWithMutable.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 
 
 class Itr : Iterator<String> by ArrayList<String>().iterator()

compiler/testData/codegen/box/casts/mutableCollections/safeAsWithMutable.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 
 
 class Itr : Iterator<String> by ArrayList<String>().iterator()

compiler/testData/codegen/box/casts/mutableCollections/weirdMutableCasts.kt

@@ -3,7 +3,7 @@
 // TODO: muted automatically, investigate should it be ran for JS or not
 // IGNORE_BACKEND: JS, NATIVE
 
-// WITH_RUNTIME
+// WITH_STDLIB
 
 fun unsupported(): Nothing = throw UnsupportedOperationException()