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

[Yumin Qi]

> 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

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/614/files
  - new: https://git.openjdk.java.net/jdk/pull/614/files/ded59cf2..e35b2025

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=614&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=614&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/614.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/614/head:pull/614

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