RFR: 8274405: Suppress warnings on non-serializable non-transient instance fields in javac and javadoc [v3]

[Joe Darcy]

> Augmentations to javac's Xlint:serial checking are out for review (#5709) and various javac and javadoc implementation libraries would need some changes to pass under the expanded checks.
> 
> The changes are to suppress warnings where non-transient fields in serializable types are not declared with a type statically known to be serializable. That isn't necessarily a correctness issues, but it does merit further scrutiny.
> 
> I'll run a script to update the copyright year before pushing.
> 
> Sending this change out for review separately in an effort to de-bulk the review needed for the new checks themselves.

Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:

  Respond to review feedback.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5728/files
  - new: https://git.openjdk.java.net/jdk/pull/5728/files/7ad3a07c..ceb0450e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5728&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5728&range=01-02

  Stats: 8 lines in 8 files changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5728.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5728/head:pull/5728

PR: https://git.openjdk.java.net/jdk/pull/5728