Since compilers don't provide such macros, do it ourselves.
In order to test these macros, add ad-hoc specializations of
QTest::toString() for qint128 and quint128 locally to the test. Turns
out it's not too hard to write them, so we might move them to a public
header, yet.
Pick-to: 6.6
Change-Id: I1483f3af2ccec6038e1c780649f9ffe413bb59ef
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
104a0a9ecd