Support Class meta-annotation attributes with ASM

Prior to this commit, AnnotationAttributesReadingVisitor treated Class
annotation attributes as Strings instead of Classes. As a result,
look-ups for Class attributes in meta-annotations failed with an
IllegalArgumentException.

This commit fixes this issue by consistently treating Class attributes
as Classes in AnnotationAttributesReadingVisitor.

Issue: SPR-11557

Author: sbrannen

spring-context/src/test/java/org/springframework/context/annotation/ComponentScanAnnotationIntegrationTests.java

@@ -109,7 +109,7 @@ public void viaContextRegistration_FromPackageOfConfigClass() {
 	}
 
 	@Test
-	public void viaContextRegistration_WithLocallyDeclaredComposedAnnotation() {
+	public void viaContextRegistration_WithComposedAnnotation() {
 		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
 		ctx.register(ComposedAnnotationConfig.class);
 		ctx.refresh();
@@ -122,19 +122,6 @@ public void viaContextRegistration_WithLocallyDeclaredComposedAnnotation() {
 			ctx.containsBean("simpleComponent"), is(true));
 	}
 
-	@Test
-	public void viaContextRegistration_WithExternallyDeclaredComposedAnnotation() {
-		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
-		ctx.register(org.springframework.context.annotation.componentscan.meta.ComposedAnnotationConfig.class);
-		ctx.refresh();
-		ctx.getBean(org.springframework.context.annotation.componentscan.meta.ComposedAnnotationConfig.class);
-		ctx.getBean(SimpleComponent.class);
-		assertThat("config class bean not found", ctx.containsBeanDefinition("composedAnnotationConfig"), is(true));
-		assertThat("@ComponentScan annotated @Configuration class registered directly against "
-				+ "AnnotationConfigApplicationContext did not trigger component scanning as expected",
-			ctx.containsBean("simpleComponent"), is(true));
-	}
-
 	@Test
 	public void viaBeanRegistration() {
 		DefaultListableBeanFactory bf = new DefaultListableBeanFactory();