Adapted isIdentity implementation.

Author: MichaelHaas99

src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotResolvedObjectTypeImpl.java

@@ -450,10 +450,10 @@ public boolean isInterface() {
 
     @Override
     public boolean isIdentity() {
-        if (!config().valhallaEnabled) {
-            return !isInterface();
+        if (config().valhallaEnabled) {
+            return isArray() || (getAccessFlags() & config().jvmAccIdentity) != 0;
         }
-        return isArray() || (getAccessFlags() & config().jvmAccIdentity) != 0;
+        return !isInterface();
     }
 
     @Override

src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotResolvedPrimitiveType.java

@@ -183,11 +183,6 @@ public boolean isInterface() {
         return false;
     }
 
-    @Override
-    public boolean isIdentity() {
-        return false;
-    }
-
     @Override
     public boolean isAssignableFrom(ResolvedJavaType other) {
         assert other != null;

src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/meta/ResolvedJavaType.java

@@ -421,6 +421,9 @@ default boolean isConcrete() {
      * @return {@code true} if this type has an identity
      */
     default boolean isIdentity(){
-        throw new UnsupportedOperationException("isIdentity is unsupported");
+        if (isPrimitive()) {
+            return false;
+        }
+        return !isInterface();
     }
 }