RFR: 8310874: Runthese30m crashes with klass should be in the placeholders during verification

[Coleen Phillimore]

On Fri, 14 Jul 2023 14:00:13 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> This is a better fix and cleanup to make placeholder use for non-parallel capable class loaders the same as the other sort of class loaders, and fixes potential problems with thread safety in the definer field of the PlaceholderEntry.   It's not easy to backport, which is why I chose the other fix for this bug.
> Tested with tier1-4 with and without injected LoaderConstrantTable::verify code.

Opening for review with @dholmes-ora comments on the Draft PR.

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PR Comment: https://git.openjdk.org/jdk/pull/14889#issuecomment-1660814197