RFR: 8254599: CDS dump should not warn about hidden classes [v2]

[Ioi Lam]

On Mon, 12 Oct 2020 23:33:20 GMT, Yumin Qi <minqi at openjdk.org> wrote:

>> Regular hidden class skipping warning in -Xshare:dump is at info log level, it is noise for a normal operation. Changed
>> to debug level, along the change, three test cases in dynamic dumping changed to debug log level to have original
>> message output.   Tests: tier1-5 in progress. Passed all local runtime/cds
>
> Yumin Qi has updated the pull request incrementally with one additional commit since the last revision:
> 
>   ResourceMark needed for logging

LGTM.

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Marked as reviewed by iklam (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/614