[llvm] [WebAssembly] Enable interleaved memory accesses (PR #125696)

[Petr Penzin via llvm-commits]

https://github.com/ppenzin commented:

The test seems to be unusually involved for a TTI change, can break if some component in its path changes. Also I am not sure how these shuffle masks would behave on x86 (@jing-bao or @fanchenkong1 question).

CC @abrown 

https://github.com/llvm/llvm-project/pull/125696