[libcxx-commits] [libcxxabi] [libcxxabi] Update ItaniumDemangle.h from LLVM (PR #140273)

[Oliver Hunt via libcxx-commits]

ojhunt wrote:

Oh, but the final version didn't need LLVM_PREFERRED_TYPE so we can remove that dependency (there were some fields that had been converted to unsigned, but in the end I changed the storage types of the enum instead, so we can remove that inclusion - just cleaning up an unneeded dependency on principle

https://github.com/llvm/llvm-project/pull/140273