fix LoopVectorization.jl issue 543

[ranocha]

This fixes JuliaSIMD/LoopVectorization.jl#543 locally for me. I have to admit that I used a Claude Opus 4.5 (preview) instance from VS Code to develop this fix.

I checked that the new @generated functions match the previous methods accepting v::VecUnroll{<:Any,W,T,<:VecUnroll{<:Any,W,T,Vec{W,T}}} defined roughly 200 lines above the new ones.

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.09%. Comparing base (a74ebae) to head (ad7af51).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/vecunroll/memory.jl	25.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
+ Coverage   52.25%   54.09%   +1.83%     
==========================================
  Files          35       35              
  Lines        6145     5951     -194     
==========================================
+ Hits         3211     3219       +8     
+ Misses       2934     2732     -202     

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[ranocha]

Looking at the latest push to the master branch, the SLEEFPirates.jl and VectorizedRNG.jl integration tests fail there, too.