[clang] [ItaniumMangle] Make sure class types are added to the dictionary of substitution candidates when compiling for older ABIs (PR #138947)

[John McCall via cfe-commits]

rjmccall wrote:

Can you confirm that the intent here is to restore mangler behavior to what it 
was prior to #132401, making the pair of PRs ABI-neutral?

https://github.com/llvm/llvm-project/pull/138947
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