RFR: 8275917: Some locks shouldn't allow_vm_block [v2]

[Coleen Phillimore]

On Wed, 27 Oct 2021 17:53:43 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> There were a few safepoint checking locks that passed allow_vm_block as true, that aren't taken by the VMThread.  I also made ClassInitError_lock behave like SystemDictionaryLock and the others in SystemDictionary::do_unloading so that doesn't require allow_vm_block either.  See the CR for more details.
>> 
>> Tested with tier1-6.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove incorrect comment.

Thanks Patricio and David.

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PR: https://git.openjdk.java.net/jdk/pull/6123