8231202: Suppress warnings on non-serializable non-transient instance fields in serializable classes

Reviewed-by: rriggs, chegar

src/java.base/share/classes/java/lang/Throwable.java

@@ -230,6 +230,7 @@ public class Throwable implements Serializable {
      * @serial
      * @since 1.7
      */
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private List<Throwable> suppressedExceptions = SUPPRESSED_SENTINEL;
 
     /** Message for trying to suppress a null exception. */

src/java.base/share/classes/java/lang/invoke/SerializedLambda.java

@@ -76,6 +76,7 @@ public final class SerializedLambda implements Serializable {
     private final String implMethodSignature;
     private final int implMethodKind;
     private final String instantiatedMethodType;
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private final Object[] capturedArgs;
 
     /**

src/java.base/share/classes/java/lang/reflect/Proxy.java

@@ -308,6 +308,7 @@ public class Proxy implements java.io.Serializable {
      * the invocation handler for this proxy instance.
      * @serial
      */
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     protected InvocationHandler h;
 
     /**