Rename exception variables in empty catch blocks

The Spring codebase sometimes ignores exceptions in catch blocks on
purpose. This is often called out by an inline comment.
We should make this more obvious by renaming the exception argument in
the catch block to declare whether the exception is "ignored" or
"expected".

See gh-35047

Signed-off-by: Vincent Potucek <vpotucek@me.com>
[brian.clozel@broadcom.com: rework commit message]
Signed-off-by: Brian Clozel <brian.clozel@broadcom.com>

spring-core/src/main/java/org/springframework/cglib/proxy/BridgeMethodResolver.java

@@ -73,7 +73,8 @@ class BridgeMethodResolver {
                 } finally {
                     is.close();
                 }
-            } catch (IOException ignored) {}
+            } catch (IOException ignored) {
+			}
         }
         return resolved;
     }

spring-core/src/main/java/org/springframework/cglib/proxy/MethodProxy.java

@@ -62,8 +62,8 @@ public class MethodProxy {
 			try {
 				proxy.init();
 			}
-			catch (CodeGenerationException ex) {
-				// Ignore - to be retried when actually needed later on (possibly not at all)
+			catch (CodeGenerationException ignored) {
+				// to be retried when actually needed later on (possibly not at all)
 			}
 		}
 		// SPRING PATCH END

spring-core/src/main/java/org/springframework/core/io/support/SpringFactoriesLoader.java

@@ -438,8 +438,7 @@ public class SpringFactoriesLoader {
 					return constructor;
 				}
 			}
-			catch (UnsupportedOperationException ex) {
-				// ignore
+			catch (UnsupportedOperationException ignored) {
 			}
 			return null;
 		}

spring-core/src/main/java/org/springframework/util/FileCopyUtils.java

@@ -229,8 +229,7 @@ public abstract class FileCopyUtils {
 		try {
 			closeable.close();
 		}
-		catch (IOException ex) {
-			// ignore
+		catch (IOException ignored) {
 		}
 	}