[Driver] Make -fvectorize and -fslp-vectorize override -O group options#161032

MaskRay merged 2 commits intomainllvm/llvm-project:mainfrom

users/MaskRay/spr/driver-make-fvectorize-and-fslp-vectorize-override-o-group-optionsllvm/llvm-project:users/MaskRay/spr/driver-make-fvectorize-and-fslp-vectorize-override-o-group-optionsCopy head branch name to clipboard