RFR: 8271073: Improve testing with VM option VerifyArchivedFields [v2]

[Calvin Cheung]

On Wed, 15 Sep 2021 17:02:06 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> - Changed the definition of `VerifyArchivedFields` from a whacky use of `bool` to an `int` and properly define its three levels:
>>   - 0: No verification 
>>   - 1: Basic verification with VM_Verify (no side effects)
>>   - 2: Detailed verification by forcing a GC (with side effects)
>> - Changed the default value to 0. The functionality checked by this flag has been very stable so there's no need to verify it in every single test case.
>> - Enabled `-XX:VerifyArchivedFields=1` for all CDS test cases.
>> - Added a new test case for `-XX:VerifyArchivedFields=2` .
>> - Also added comments about that this flag is suppose to check for.
>
> Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:
> 
>   the test should require vm.cds.write.archived.java.heap

Looks good.

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Marked as reviewed by ccheung (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5514