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

Wed May 7 12:31:02 PDT 2025

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

https://github.com/llvm/llvm-project/pull/132401 made changes to the function that mangles member pointer types, which caused substitutions to be mangled incorrectly.

Make sure addSubstitution is called in mangleCXXRecordDecl unless vtables are being mangled (see https://github.com/llvm/llvm-project/pull/109970 for why that is needed).

rdar://149307496

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