Merge pull request mono/mono#14552 from lewurm/interp-dimcall-fix

[interp] add missing enum check on constrained callvirt

Commit migrated from mono/mono@84bc4bf

src/mono/mono/mini/interp/transform.c

@@ -1896,7 +1896,7 @@ interp_transform_call (TransformData *td, MonoMethod *method, MonoMethod *target
 				 * but that type doesn't override the method we're
 				 * calling, so we need to box `this'.
 				 */
-				if ((td->sp - csignature->param_count - 1)->type == STACK_TYPE_MP) {
+				if (target_method->klass == mono_defaults.enum_class && (td->sp - csignature->param_count - 1)->type == STACK_TYPE_MP) {
 					/* managed pointer on the stack, we need to deref that puppy */
 					/* Always load the entire stackval, to handle also the case where the enum has long storage */
 					interp_add_ins (td, MINT_LDIND_I8);