RFR: 8341633: StatSampler::assert_system_property: Print the keys and values of the assert

[Johan Sjölen]

Hi,

This trivial PR adds that the failing assert also prints the differing values so that we can more easily debug what's wrong when this assert is triggered.

Thanks.

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

Commit messages:
 - Print the values

Changes: https://git.openjdk.org/jdk/pull/21386/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21386&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341633
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21386.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21386/head:pull/21386

PR: https://git.openjdk.org/jdk/pull/21386