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/tests-common/tests/org/jetbrains/kotlin/ir/AbstractIrGeneratorTestCase.kt

@@ -67,6 +67,9 @@ abstract class AbstractIrGeneratorTestCase : CodegenTestCase() {
             if (InTextDirectivesUtils.isDirectiveDefined(file.content, "WITH_RUNTIME")) {
                 addRuntime = true
             }
+            if (InTextDirectivesUtils.isDirectiveDefined(file.content, "WITH_STDLIB")) {
+                addRuntime = true
+            }
             if (InTextDirectivesUtils.isDirectiveDefined(file.content, "WITH_REFLECT")) {
                 addReflect = true
             }