Use `blender::Stack` instead of `BLI_Stack`. Theoretically this can
improve performance because it makes use of inlining to remove function
call overhead and give the compiler more information. I observed a build
time improvement of about 4%, from 1156 to 1113 ms with 30k cube objects.
Notably, now `deg_graph_flush_visibility_flags` doesn't call any
non-inlined functions.
Pull Request: https://projects.blender.org/blender/blender/pulls/137355
0ee5e6ded7