[jdk17u-dev] RFR: 8288360: CI: ciInstanceKlass::implementor() is not consistent for well-known classes

[Goetz Lindenmaier]

I backport this for parity with 17.0.5-oracle.

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Commit messages:
 - Backport 50f99c3208fc9f479cc109fb6e73d262e27026a2

Changes: https://git.openjdk.org/jdk17u-dev/pull/516/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=516&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288360
  Stats: 7 lines in 1 file changed: 2 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/516.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/516/head:pull/516

PR: https://git.openjdk.org/jdk17u-dev/pull/516