RFR: 8298614: Support CDS heap dumping for SerialGC and ParallelGC [v3]

[Matias Saavedra Silva]

> This patch upstreams [JDK-8333222](https://bugs.openjdk.org/browse/JDK-8333222) from the Leyden repo to support Serial and Parallel GC for CDS. Additional test fixes not in that patch were added. Verified with tier 1-5 tests.

Matias Saavedra Silva has updated the pull request incrementally with one additional commit since the last revision:

  Change require flagless to require G1

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21004/files
  - new: https://git.openjdk.org/jdk/pull/21004/files/905fdfd3..9b8cd5fa

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21004&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21004&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21004.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21004/head:pull/21004

PR: https://git.openjdk.org/jdk/pull/21004