RFR: 8279009: CDS crashes when the source of an InstanceKlass is NULL [v3]

[Yumin Qi]

> Please review
>   When user combine -XX:ArchiveClassesAtExit and -XX:DumpLoadedClassList, vm will generate shared archive at exit mean while dump class list to a file, it will encounter null source when lambda form invoker holder classes are regenerated which have no source.  It failed to output the NULL source.
>    The fix is simply add ing check if the source exists. 
>    For unregistered classes loaded from shared space, they should be filtered out since the source are not recorded in shared space.
> 
>    Tests: tier2,tier2.tier3,tier4
> 
> Thanks
> Yumin

Yumin Qi has updated the pull request incrementally with one additional commit since the last revision:

  Remove unused export modules, clean up comments

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7072/files
  - new: https://git.openjdk.java.net/jdk/pull/7072/files/fad5ae5b..99792cfc

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7072&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7072&range=01-02

  Stats: 17 lines in 2 files changed: 2 ins; 10 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7072.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7072/head:pull/7072

PR: https://git.openjdk.java.net/jdk/pull/7072