RFR: 8329875: Serial: Move preservedMarks.inline.hpp to serialFullGC.cpp

[Albert Mingkun Yang]

Trivial moving included inline.hpp to cpp.

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Commit messages:
 - trivial

Changes: https://git.openjdk.org/jdk/pull/18678/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18678&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8329875
  Stats: 3 lines in 2 files changed: 1 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18678.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18678/head:pull/18678

PR: https://git.openjdk.org/jdk/pull/18678