RFR: 8313961: Enhance identification of special serialization methods [v2]

[Raffaello Giulietti]

> This improves the identification of the serialization magic fields and methods.

Raffaello Giulietti has updated the pull request incrementally with one additional commit since the last revision:

  Removed a spurious, unintended file.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15364/files
  - new: https://git.openjdk.org/jdk/pull/15364/files/bc93873f..b74bc7a3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15364&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15364&range=00-01

  Stats: 33 lines in 1 file changed: 0 ins; 33 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15364.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15364/head:pull/15364

PR: https://git.openjdk.org/jdk/pull/15364