As discussed at pytorch/vision#3051, the use of constexpr at ir.h and pickler.h raises member may not be initialized errors on TorchVision on Windows. We should consider replacing it with CONSTEXPR_EXCEPT_WIN_CUDA.

This issue has appeared before and was patched in different places: #27958, #39394, #7962

cc @peterjc123 @maxluk @nbcsm @guyang3532 @gunandrose4u @mszhanyi @skyline75489