RFR: 8264126: Remove TRAPS/THREAD parameter for class loading functions

[Coleen Phillimore]

On Wed, 24 Mar 2021 17:02:38 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

>> find_constrained_instance_or_array_klass only passes THREAD so that it can be used in a MutexLocker for SystemDictionary_lock. This can use the MutexLocker that gets Thread::current() without any harm to performance.
>> 
>> The other functions add_loader_constraint, record_linking_constraints, and check_signature_loaders fall out from that.
>> 
>> check_signature_loaders should throw an exception but it unfortunately makes the caller construct the exception message so it doesn't.
>> 
>> Also: is_shared_class_visible{_impl}
>> 
>> Tested with tier1 on 4 Oracle platforms (in progress)
>
> LGTM.

Thanks Calvin!

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PR: https://git.openjdk.java.net/jdk/pull/3176