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CheckerGccPlugins: Fix false positive on call via a member function pointer.

Scott Snyder requested to merge ssnyder/atlasexternals:checkers-memfunc-20190208 into master

We could get a false positive from the thread-safety checker about discarded const on calls via a member function pointer:

struct C {
  int doit(int i) const;
  template<typename F>
  int func(F f) const {
    return (this->*f)(42);
  }
};

void foo() {
  C c;
  c.func(&C::doit);
}

Fixed. Thanks to Frank W. for the report.

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