CheckerGccPlugins: Thread checker updates.
The check for discarding const in a function call was giving a false positive for the case of a non-const reference binding to a pointer to a const object.
Don't warn about a mutable std::recursive_mutex.
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The check for discarding const in a function call was giving a false positive for the case of a non-const reference binding to a pointer to a const object.
Don't warn about a mutable std::recursive_mutex.