This patch is targeted at the case where the item's inline axis is the main
axis (which typically means a row-oriented flex container).
If our flex item has a "pre-stretched" block size (from align-self:stretch),
then this patch lets its inline-axis content-size-measurements take that
stretched size into account, in case they impact the resulting inline-axis
measurement. That is, the pre-stretched block size can transfer through
aspect-ratio as the inline-size.
Differential Revision: https://phabricator.services.mozilla.com/D131261
5545ca63c0