replace std::aligned_union

Since we're only describing the type size and alignment,
we can just use ordinary unions here.

This fixes the size and alignment of AllVertexData,
I think.

Bug: skia:10921
Change-Id: Ife5c1a1f52caf463d28a78b1f35d78e0bbeaeddc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/333478
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed