QLocale: improve speed of 'applyIntegerFormatting()'

This patch reduced the runtime of "QString::number(12345678)"
from 119ns to 84ns in one measurement. It removes one copy of a
QString into a local lambda function, it adds a std::move on
return, removing another QString instantiation and it removes
the usage of StringBuilder on return, which created another QString.

Task-number: QTBUG-87330
Change-Id: Ia37e314353c354ae04402cd482d0f7aeabbfc0cb
Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

0 files changed, 0 insertions, 0 deletions