RFR: 8293182: Improve testing of CDS archive heap [v7]

[Ioi Lam]

> Currently, the CDS archive heap supports a fixed set of built-in classes, specified by hard-coded lists in heapShared.cpp:
> 
> https://github.com/openjdk/jdk/blob/372fc58e897d25713db0dfe289ed25c40d9a3985/src/hotspot/share/cds/heapShared.cpp#L104-L107
> 
> As we plan to improve the archive heap, it becomes critical to be able to write specific test cases for different scenarios.
> 
> For example, supporting LambdaForms in the CDS archive heap would require archiving enums of the type [sun.invoke.util.Wrapper](https://github.com/openjdk/jdk/blob/607612899678234c093dc644d3a40cb831c7e43b/src/java.base/share/classes/sun/invoke/util/Wrapper.java), which doesn't work yet (see [JDK-8293187](https://bugs.openjdk.org/browse/JDK-8293187)). This RFE makes it possible to develop support for sun.invoke.util.Wrapper separately, without implementing the full support of LambdaForms in a single colossal step.
> 
> - Added `-XX:ArchiveHeapTestClass` to inject extra classes into the archive heap. See the test case ArchiveHeapTestClass.java for examples. For paranoia, This flag is available only in debug builds.
> - I also tighten the requirement for the type of classes that can be stored into the archive heap. E.g., we no longer allow classes outside of the `java.base` module.

Ioi Lam has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains eight commits:

 - Merge branch 'master' into 8293182-improve-archive-heap-testing
 - @coleenp comments
 - fixed minimal build
 - Use help message suggedted by @calvinccheung
 - clarified assert message
 - @calvinccheung comments
 - fixed build (gcc spurious warning)
 - 8293182: Improve testing of CDS archive heap

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Changes: https://git.openjdk.org/jdk/pull/10110/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10110&range=06
  Stats: 602 lines in 11 files changed: 521 ins; 32 del; 49 mod
  Patch: https://git.openjdk.org/jdk/pull/10110.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10110/head:pull/10110

PR: https://git.openjdk.org/jdk/pull/10110