[WIP] Try to enable LLVM auto vectorization. #6899
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Issue: #6771
This is a proof of concept that LLVM auto vectorization can be leveraged by not offloading CPU range for and re-enable loop invariant code motion pass for single-level loops.
Apparently, multithreading is disabled with this regard.
Single threaded performance on M1: 7.5GB/s -> 50GB/s
Brief Summary