[llvm] [CodeView] Read and dump LF_ALIAS (PR #218243)

[Reid Kleckner via llvm-commits]

https://github.com/rnk commented:

Interesting. It sounds like there's a "PDB schema change" coming, if that's the right word for it.

I seem to recall that Symbol UDTs were a major bottleneck for PDB writing, so it makes sense that Microsoft would seek to shift that information from the symbol record stream over to the type record stream, where it gets merged more efficiently.

It then just becomes a question of figuring out which typedefs are active in which translation unit, and I don't know how they'll do it. I guess that's a relevant question for LLDB.

https://github.com/llvm/llvm-project/pull/218243