[clang] [Serialization] [ASTWriter] Try to not record namespace as much as possible (PR #179178)

[Aiden Grossman via cfe-commits]

boomanaiden154 wrote:

> Seems related. You can revert this after providing a reproducer.

Thanks. CVise will hopefully have something ready in the next couple hours.

> BTW, who is the person that I need to contact for testing related changes? I pinged @jtstogel but he seems not active. Should I ping you @boomanaiden154 or @alanzhao1 or anyone else to test similar things. Revert after landing is common but we can try to avoid it.

Agreed, after landing isn't ideal. You can ping me and I can try and get to it. We have a rotation internally and whoever is oncall gets stuck dealing with the breakage. We should probably have something similar for preemptive testing, but we don't have anything set up currently.

https://github.com/llvm/llvm-project/pull/179178