aux/tc: handle stride mismatch during rp-optimized subdata

aux/tc: handle stride mismatch during rp-optimized subdata

to avoid splitting renderpasses, this subdata optimization handles the usual
driver dance of staging buffer -> gpu copy

if the pbo stride doesn't match the image format's stride, however, then
a direct copy will yield broken pixels and the image will misrender. to avoid this,
detect stride mismatch and translate the single subdata call into a sequence
of non-overlapping subdata calls that the driver can magically figure out
while continuing to not split renderpasses

fixes #9589

cc: mesa-stable

Acked-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24849>