Bug 882339 part B - nsPluginTag::IsBlocklisted should use the cached blocklist state, since it gets called in some tight loops via plugintag.IsActive r=johns Once more with feeling!

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extra : rebase_source : 50342011c886109a25a7a38d18b23cde7c4e4c85
Bug 884194 - Update fun->isHeavyweight() when replacing a lazy script with a preexisting script, r=luke.