RFR: 8271598: CDS classlist file should support uber JARs

[Calvin Cheung]

Currently, for archive classes for custom loaders, CDS supports the following source locations in the classlist:

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Commit messages:
 - 8271598: CDS classlist file should support uber JARs

Changes: https://git.openjdk.java.net/jdk/pull/5876/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5876&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271598
  Stats: 695 lines in 15 files changed: 620 ins; 62 del; 13 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5876.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5876/head:pull/5876

PR: https://git.openjdk.java.net/jdk/pull/5876