RFR: 8323738: Serial: Remove unreachable methods in Generation [v2]

[Albert Mingkun Yang]

> Trivial removing effectively dead code.

Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:

  review

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17429/files
  - new: https://git.openjdk.org/jdk/pull/17429/files/dce6fbdb..5b6a23ee

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17429&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17429&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/17429.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17429/head:pull/17429

PR: https://git.openjdk.org/jdk/pull/17429