RFR: 8328630: Add logging when needed symbols in dll are missing. [v2]

[Robbin Ehn]

> Hi, please consider this additional logging.
> 
> Thanks, Robbin

Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:

  clear errors, comment

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18404/files
  - new: https://git.openjdk.org/jdk/pull/18404/files/1426f399..bb1f45ed

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18404&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18404&range=00-01

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18404.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18404/head:pull/18404

PR: https://git.openjdk.org/jdk/pull/18404