RFR: 8324514: ClassLoaderData::print_on should print address of class loader

[Aleksey Shipilev]

This looks like a simple diagnostic regression from [JDK-8201556](https://bugs.openjdk.org/browse/JDK-8201556). Instead of printing the address of the `OopHandle` slot, we really want to print the address of the classloader that handle holds. That was not intentional, right, @coleenp?

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Commit messages:
 - Fix

Changes: https://git.openjdk.org/jdk/pull/17534/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17534&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324514
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17534.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17534/head:pull/17534

PR: https://git.openjdk.org/jdk/pull/17534