Arm simd optimize for fht

[jingyueob]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@            Coverage Diff             @@
##             main     #931      +/-   ##
==========================================
+ Coverage   90.12%   90.66%   +0.54%     
==========================================
  Files         275      275              
  Lines       16059    16031      -28     
==========================================
+ Hits        14473    14535      +62     
+ Misses       1586     1496      -90     

Flag	Coverage Δ
cpp	90.66% <ø> (+0.54%)	⬆️

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Components	Coverage Δ
common	92.03% <ø> (+0.33%)	⬆️
datacell	92.21% <0.00%> (+1.75%)	⬆️
index	88.48% <ø> (+0.08%)	⬆️
simd	100.00% <ø> (ø)

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