[clang] [clang-tools-extra] [lldb] Reland: [clang] preserve class type sugar when taking pointer to member (PR #132401)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

> We are now seeing non-determinism in `.pcm` files that root-causes to this commit.
> 
> @mizvekov - might it be something obvious, like pointer-keyed containers or similar?

I don't see anything obvious. The only parts of the patch which touch anything similar to pointer-keyed containers are the type properties cache changes, like the linkage computation.

https://github.com/llvm/llvm-project/pull/132401