RFR: 8244778: Archive full module graph in CDS

[Ioi Lam]

This is the same patch as
[8244778-archive-full-module-graph.v03](http://cr.openjdk.java.net/~iklam/jdk16/8244778-archive-full-module-graph.v03/)
published in
[hotspot-runtime-dev at openjdk.java.net](https://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2020-August/041496.html).

The rest of the review will continue on GitHub. I will add new commits to respond to comments to the above e-mail.

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Commit messages:
 - fixed trailing spaces
 - Renamed ModuleEntry::write_growable_array
 - Update to latest repo (JDK-8251557); added comments
 - 8244778: Archive full module graph in CDS

Changes: https://git.openjdk.java.net/jdk/pull/80/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=80&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8244778
  Stats: 2039 lines in 59 files changed: 1887 ins; 26 del; 126 mod
  Patch: https://git.openjdk.java.net/jdk/pull/80.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/80/head:pull/80

PR: https://git.openjdk.java.net/jdk/pull/80