remove code redundant with use of @NotExternalValue annotation

Author: dougxc

compiler/src/jdk.graal.compiler/src/jdk/graal/compiler/hotspot/CompilerConfig.java

@@ -34,7 +34,6 @@
 import java.util.List;
 import java.util.Locale;
 
-import jdk.graal.compiler.nodes.GraphEncoder;
 import org.graalvm.collections.EconomicMap;
 import org.graalvm.collections.MapCursor;
 
@@ -82,11 +81,6 @@ public static void main(String[] args) throws Exception {
         EncodedSnippets encodedSnippets = getEncodedSnippets(replacements, options);
         List<Field> externalValueFields = ObjectCopier.getExternalValueFields();
 
-        // The NodeClassMap value read from GraphEncoder.GLOBAL_NODE_CLASS_MAP
-        // must not be treated as an external value when being serialized
-        // across processes.
-        externalValueFields.remove(ObjectCopier.getField(GraphEncoder.class, "GLOBAL_NODE_CLASS_MAP"));
-
         EconomicMap<String, Object> encodedObjects = EconomicMap.create();
         encodedObjects.put("encodedSnippets", encodedSnippets);
         encodedObjects.put("snippetNodeClasses", snippetNodeClassesToJSON(encodedSnippets));