The old code only tested with seed = 0 and seed = 1045982819, the
latter being a "random number", which, however, fits into
32-bits. Since Qt 6.0 increased the seed from uint to size_t, amend
the test to actually test a seed value with some of the upper half of
bits set, too, also in 64-bit mode.
While we're at it, also test with each seed's bits flipped for extra
coverage.
Remove a static assertion that prevented testing seeds with the MSB
set.
Pick-to: 6.6 6.5 6.2
Change-Id: I5ed6ffb5cabaaead0eb9c01f994d15dcbc622509
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
8ca319a172