RFR: 8264322: Generate CDS archive when creating custom JDK image [v2]

[Calvin Cheung]

> Please review this change for adding a `jlink` command line option `--generate-cds-archive` for generating CDS archives as a post processing step during the creation of a custom JDK image.
> 
> Details can be found in the corresponding CSR [JDK-8269178](https://bugs.openjdk.java.net/browse/JDK-8269178).
> 
> Testing:
> 
> - [x] tiers 1,2 (including the new test)

Calvin Cheung has updated the pull request incrementally with one additional commit since the last revision:

  @mlchung comments

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5174/files
  - new: https://git.openjdk.java.net/jdk/pull/5174/files/918d5066..b7a5ec68

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5174&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5174&range=00-01

  Stats: 74 lines in 10 files changed: 14 ins; 39 del; 21 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5174.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5174/head:pull/5174

PR: https://git.openjdk.java.net/jdk/pull/5174