RFR: 8303467: Serial: Refactor reference processor

Wed Mar 1 16:50:53 UTC 2023

Simple refactoring and removing some unnecessary afterwards.

Test: tier1-5

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Commit messages:
 - s1-ref-process

Changes: https://git.openjdk.org/jdk/pull/12809/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12809&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303467
  Stats: 150 lines in 13 files changed: 32 ins; 110 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/12809.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12809/head:pull/12809

PR: https://git.openjdk.org/jdk/pull/12809