[x264-devel] Fix ppc64* pink artefacting and not passing test suite for Altivec optimizations

[jfiusdq]

Hello,
The x264 encoder produced invalid outputs on ppc64le with visual pink/green artifacts in encoded videos.

3 weeks ago I published a rather simple MR that fixes it (endianess UB and OOB read UB).

I was told that maybe I should be forwarding my MR here, sorry if that's not appropriate.

https://code.videolan.org/videolan/x264/-/merge_requests/196

It should be rather easy to review, and I have tested it on both POWER9 LE and BE with the test suite and it passes all tests on both, and I'm using the library myself with my patch for transcoding at some scale on LE and it's been going well.

Thank you
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