This was as easy as running the script and running
update_test_checks. I did notice the pass produces some GEPs with 0
indexes, such that running the opaquify script a second time produces
a diff.
When adding support for scalable vector masked loads and stores we
accidently opened up likewise for fixed length vectors. This patch
restricts support to scalable vectors only, thus ensuring fixed
length vectors are treated the same regardless of SVE support.
Differential Revision: https://reviews.llvm.org/D83341