Fix an instance of move-pessimization.

include/gtest/internal/gtest-port.h

@@ -1334,7 +1334,7 @@ const T& move(const T& t) {
 // similar functions users may have (e.g., implicit_cast). The internal
 // namespace alone is not enough because the function can be found by ADL.
 template<typename To>
-inline To ImplicitCast_(To x) { return ::testing::internal::move(x); }
+inline To ImplicitCast_(To x) { return x; }
 
 // When you upcast (that is, cast a pointer from type Foo to type
 // SuperclassOfFoo), it's fine to use ImplicitCast_<>, since upcasts