Remerge pull request #15995 from mlugg/fix/union-field-ptr-align
Sema: copy pointer alignment to union field pointers
This is an unrevert of 43c98dc11567eeb38be041c7dad179c53156f3df.
2282c27885Jacob Young committed on 7/1/2023, 3:23:26 AMparents0a6cd25402b958