Improve alias redefinition warnings#9447
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Make these a single warning call to be a single write as in CRuby.
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The exact old method should be marked as aliased, so if re-aliased back again it won't trigger a warning. See jruby#9447
This is CRuby behavior and Rails uses it as a hack for reverse- aliasing methods without warnings. See rails/rails#29233
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These warnings are firing a lot in Rails when they should not. The key piece is setting the aliased method's aliased bit so aliasing back doesn't warn, based on the hack in rails/rails#29233. This PR makes tweaks to handle that case and clean up related code.