Add const in front of local variables when applicable.
Replace const by constexpr when the value of the variable can be
calculated at compile-time.
Task-number: QTBUG-108861
Change-Id: I2cd1bc97aaa07d6d564731d9ccddba9a74e96fef
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
(cherry picked from commit 7903a52d46401e224f1d85067d51bf443066cbec)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit f67e649e9b47122c0cbe6bc03d82dfbca8a5949c)
20966dc53f