QCOMPARE() can report enum values by name just fine, no need to
laboriously convert them to strings. While comparing all tags in one
go did allow a more comprehensive report, it's enough to know we
failed; this is testing cross-platform code, so a debugger can tell us
all those extra details if we get a failure.
Testing qHash() doesn't distinguish equal things is fairly low value;
at least avoid duplicating the construction of the reference value.
Replace a bunch of other QVERIFY()s with the new cousins of QCOMPARE()
for ordered and different comparisons.
In the process, mark some of the QLocale objects as const.
Change-Id: Ic93b8ed60c6f2cc846fbba428983778896d61291
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>