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/writeSignature/declarationSiteVariance/jvmWildcardAnnotations/onFunction.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 class Out<out T>
 class In<in R>
 open class Open

compiler/testData/writeSignature/declarationSiteVariance/jvmWildcardAnnotations/onTypes.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 class OutPair<out T, out E>
 class Out<out F>
 class In<in H>

compiler/testData/writeSignature/declarationSiteVariance/jvmWildcardAnnotations/primitiveTypes.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 class Out<out T>
 class In<in E>
 

compiler/testData/writeSignature/declarationSiteVariance/wildcardOptimization/fields.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 class Out<out T>
 
 class Final

compiler/testData/writeSignature/parameterlessMain/notJvmMainName.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 fun main() {
 
 }

compiler/testData/writeSignature/suspendMain/parameterlessSuspendMain.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 suspend fun main() {
 
 }

compiler/testData/writeSignature/suspendMain/suspendMain.kt

@@ -1,4 +1,4 @@
-// WITH_RUNTIME
+// WITH_STDLIB
 suspend fun f(): Int {
   return 4
 }