[llvm] [WebAssembly] [Backend] Wasm optimize illegal bitmask (PR #145627)

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badumbatish wrote:

@sparker-arm hi there! i'm not sure who to tag for this issue I'm having, but would it be possible for a <64 x i4> to be converted to 2 v128 since <64 x i8> can be converted to 4 v128? Right now without converting to v128, the assembly degenerates to about 400 lines. 

If its possible to convert <64 x i4> to 2 v128, I'd appreciate some pointers or some directions on where to proceed next

https://github.com/llvm/llvm-project/pull/145627