Detect bridge methods across ApplicationContexts in MethodIntrospector

Prior to this commit, MethodIntrospector failed to properly detect
bridge methods for subsequent invocations of selectMethods() with the
same targetType and MetadataLookup, if such subsequent invocations
occurred after the ApplicationContext had been refreshed.

The reason this occurs is due to the following.

- Class#getDeclaredMethods() always returns "child copies" of the
  underlying Method instances -- which means that `equals()` should be
  used instead of `==` whenever the compared Method instances can come
  from different sources (such as the static caches mentioned below).

- BridgeMethodResolver caches resolved bridge methods in a static cache
  -- which is never cleared.

- ReflectionUtils caches declared methods in a static cache
  -- which gets cleared when an ApplicationContext is refreshed.

Consequently, if you attempt to load an ApplicationContext twice in the
same ClassLoader, the second attempt uses the existing, populated cache
for bridged methods but a cleared, empty cache for declared methods.
This results in new invocations of Class#getDeclaredMethods(), and
identity checks with `==` then fail to detect equivalent bridge methods.

This commit addresses this by additionally comparing bridge methods
using `equals()` in MethodIntrospector.selectMethods().

Note that the `==` checks remain in place as an optimization for when
`equals()` is unnecessary.

Closes gh-32586

(cherry picked from commit e702733c7b)

spring-core/src/main/java/org/springframework/core/MethodIntrospector.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -36,6 +36,7 @@ import org.springframework.util.ReflectionUtils;
  *
  * @author Juergen Hoeller
  * @author Rossen Stoyanchev
+ * @author Sam Brannen
  * @since 4.2.3
  */
 public final class MethodIntrospector {
@@ -75,6 +76,7 @@ public final class MethodIntrospector {
 				if (result != null) {
 					Method bridgedMethod = BridgeMethodResolver.findBridgedMethod(specificMethod);
 					if (bridgedMethod == specificMethod || bridgedMethod == method ||
+							bridgedMethod.equals(specificMethod) || bridgedMethod.equals(method) ||
 							metadataLookup.inspect(bridgedMethod) == null) {
 						methodMap.put(specificMethod, result);
 					}