Arm backend: Fix bug of inserting unnecessary casts for aten.where.self#11816

zingo merged 3 commits intopytorch:mainpytorch/executorch:mainfrom

YufengShi-dudu:add-int32-support-to-where-opYufengShi-dudu/executorch:add-int32-support-to-where-opCopy head branch name to clipboard