[libcxx] [test] Fix an operator precedence mistake in valarray.unary/not.pass.cpp.

[STL_MSFT]

Summary

Fix an operator precedence mistake in valarray.unary/not.pass.cpp. This one was sneaky - the test happened to be passing, but totally by accident.

You can thank MSVC warning C4805 "'==': unsafe mix of type 'bool' and type 'T' in operation" for this one.

[EricWF]

Good catch. Thanks.

[EricWF]

r273352.

test/std/numerics/numarray/template.valarray/valarray.unary/not.pass.cpp

int main()
     {
         typedef double T;
         T a[] = {1, 2.5, 3, 4.25, 5};
         const unsigned N = sizeof(a)/sizeof(a[0]);
         std::valarray<T> v(a, N);
         std::valarray<bool> v2 = !(v + v);
         assert(v2.size() == v.size());
         for (int i = 0; i < v2.size(); ++i)
-            assert(v2[i] == !2*v[i]);
+            assert(v2[i] == !(2 * v[i]));
     }
 }