QtJson: simplify/add missing relational operators involving Latin1String

As noted by Mat Sutcliffe <oktal3700@gmail.com>, there were
no relational operators for Latin1String/QLatin1String and
String/QLatin1String mixed comparisons, leading to implicit
conversions from QL1S to QString in Entry::op==(QL1S).

This patch fixes half of the issue, by providing the operators
for Latin1String/QLatin1String. In doing so, it cleans up their
definition (non-members, non-friends, delegating to existing
QL1S operators where possible, passing both {Q,}Latin1String by
value, as they're both Trivially Copyable and small).

A follow-up patch will deal with String/QLatin1String
comparisons. It will be not quite as straight-forward as
this patch, since we don't, yet, have QStringView, the
UTF-16 equivalent of QL1S, available.

Amends a5159cc50aa0f8a57b6f736621b359a3bcecbf7e.

Change-Id: I596358eb3ccf847b7680f171f9992f3fad80132c
Reviewed-by: Mat Sutcliffe <oktal3700@gmail.com>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

0 files changed, 0 insertions, 0 deletions