RFR: 8299275: Add some ClassLoaderData verification code [v2]

[Coleen Phillimore]

> I added some verification code to try to help track down JDK-8296915 (https://bugs.openjdk.org/browse/JDK-8296915).
> Ran Test: runtime/SelectionResolution/InvokeInterfaceSuccessTest.java 100x with -XX:+VerifyBefore/AfterGC.
> Tested with tier1-4.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Cast to Klass

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11856/files
  - new: https://git.openjdk.org/jdk/pull/11856/files/4701cf48..4775cbc9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11856&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11856&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11856.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11856/head:pull/11856

PR: https://git.openjdk.org/jdk/pull/11856