bkramer added a comment.

GitHub finds around 1.9k instances of this pattern to compute `alignof`. 
There's a lot of duplicates and `#ifdefs` so the real number is going to be 
smaller, but it seems to be quite common. The annoying part is that there is no 
`_Alignof` in C99 so for many of those projects there is no easy fix.

Can this be demoted to a warning?

https://github.com/search?type=code&q=%2Foffsetof%5Cs*%5C%28%5Cs*struct%5Cs*%5C%7B%2F+lang%3Ac


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D133574/new/

https://reviews.llvm.org/D133574

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