RFR: 8326659: Serial: Remove redundant TenuredSpace::print_on

[Albert Mingkun Yang]

Trivial removing effectively dead code.

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Commit messages:
 - trivial

Changes: https://git.openjdk.org/jdk/pull/18005/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18005&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326659
  Stats: 10 lines in 2 files changed: 0 ins; 10 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18005.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18005/head:pull/18005

PR: https://git.openjdk.org/jdk/pull/18005