Just using the hardcoded bitmasks triggered the bug fixed in commit e8f2eeac92 - so just do that as the test.
e8f2eeac92
The bitmasks with the 31st, 32nd and 63rd bit set are added. The make up the largest bitmasks on 32bit/64bit that can be represented without allocating and the smallest bitmask on 32bit that must be allocated.
(Actually, it's not a real 'new' value yet, but will be soon. This is the first step to make bitmasks immutable.