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

[Calvin Cheung]

On Wed, 24 Mar 2021 16:20:30 GMT, Coleen Phillimore <coleenp 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.

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Marked as reviewed by ccheung (Reviewer).

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