RFR: 8317994: Serial: Use SerialHeap in generation

Thu Oct 12 09:15:31 UTC 2023

Simple renaming and removing of redundant macro guards.

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Commit messages:
 - s1-generation

Changes: https://git.openjdk.org/jdk/pull/16162/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16162&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317994
  Stats: 17 lines in 2 files changed: 1 ins; 8 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/16162.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16162/head:pull/16162

PR: https://git.openjdk.org/jdk/pull/16162