Method EqMatcher

tests/gtest/gtest.h:9472–9473

class EqMatcher : public ComparisonBase<EqMatcher<Rhs>, Rhs, AnyEq> {
 public:
  explicit EqMatcher(const Rhs& rhs)
      : ComparisonBase<EqMatcher<Rhs>, Rhs, AnyEq>(rhs) { }
  static const char* Desc() { return "is equal to"; }
  static const char* NegatedDesc() { return "isn't equal to"; }
};