[clang] [llvm] [LLVM][SROA] Teach SROA how to "bitcast" between fixed and scalable vectors. (PR #130973)

[Ricardo Jesus via cfe-commits]

https://github.com/rj-jesus commented:

This looks good as far as I can see, but I don't feel qualified to approve it.
FWIW it fixes a large regression on GROMACS with LLVM 20.

https://github.com/llvm/llvm-project/pull/130973