Add BooleanSupplier for crema on/off

Author: gilles-duboscq

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/hub/RuntimeClassLoading.java

@@ -27,8 +27,11 @@
 import static jdk.graal.compiler.options.OptionStability.EXPERIMENTAL;
 
 import java.security.ProtectionDomain;
+import java.util.function.BooleanSupplier;
 
 import org.graalvm.collections.EconomicMap;
+import org.graalvm.nativeimage.Platform;
+import org.graalvm.nativeimage.Platforms;
 
 import com.oracle.svm.core.SubstrateOptions;
 import com.oracle.svm.core.hub.crema.CremaSupport;
@@ -122,6 +125,22 @@ public static boolean isSupported() {
         return Options.RuntimeClassLoading.getValue();
     }
 
+    @Platforms(Platform.HOSTED_ONLY.class)
+    public static final class NoRuntimeClassLoading implements BooleanSupplier {
+        @Override
+        public boolean getAsBoolean() {
+            return !isSupported();
+        }
+    }
+
+    @Platforms(Platform.HOSTED_ONLY.class)
+    public static final class WithRuntimeClassLoading implements BooleanSupplier {
+        @Override
+        public boolean getAsBoolean() {
+            return isSupported();
+        }
+    }
+
     public static Class<?> defineClass(ClassLoader loader, String expectedName, byte[] b, int off, int len, ClassDefinitionInfo info) {
         if (PredefinedClassesSupport.hasBytecodeClasses()) {
             Class<?> knownClass = PredefinedClassesSupport.knownClass(b, off, len);