[compiler-rt] [compiler-rt] Refactor Windows IN_SECTION declarations (PR #216582)

[Thurston Dang via llvm-commits]

https://github.com/thurstond commented:

Please update the pull request description to explain what this specific patch does, instead of sharing the same description for all patches in the series. e.g., "This refactors all uses of `__declspec(allocate())` on Windows to use an equivalent newly defined macro, IN_SECTION. Future work (https://github.com/llvm/llvm-project/pull/209902) will generalize IN_SECTION to work for GNU."

IIUC, this patch is No Functional Change. If that's intended to be the case, please prefix the pull request title with [NFC].

https://github.com/llvm/llvm-project/pull/216582