RFR: 8273508: Support archived heap objects in SerialGC [v4]

[Ioi Lam]

> When `-XX:+UseSerialGC is enabled`, load the CDS archived heap objects into `SerialHeap::old_gen()` during VM bootstrap. This improves VM start-up time, mostly because the module graph can be loaded from the archive.
> 
> 
> $ perf stat -r 40 java -XX:+UseSerialGC -version
> 
> Before: 0.042484507 seconds time elapsed ( +- 0.72% )
> After:  0.031671000 seconds time elapsed ( +- 0.72% )
> 
> 
> Changes in the gc subdirectories are contributed by @tschatzl

Ioi Lam has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:

 - Merge branch 'master' into 8273508-archived-heap-objects-for-serial-gc
 - Exclude TestSerialGCWithCDS.java from hotspot_appcds_dynamic test group
 - Comments from @calvinccheung
 - Merge branch 'master' into 8273508-archived-heap-objects-for-serial-gc
 - @tschatzl comments
 - 8273508: Support archived heap objects in SerialGC

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5596/files
  - new: https://git.openjdk.java.net/jdk/pull/5596/files/41ce0bf0..1ae36713

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5596&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5596&range=02-03

  Stats: 1785 lines in 29 files changed: 1293 ins; 360 del; 132 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5596.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5596/head:pull/5596

PR: https://git.openjdk.java.net/jdk/pull/5596