[clang] WIP: [clang] MicrosoftCXXABI: Fix exception copy constructor LUT after loading AST (PR #114075)

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

I have no idea here as this touches both modules AND MSVC ABI.  That said, it seems really odd that we'd have to store this rather than calculate it on deserialization.

Perhaps @ChuanqiXu9 can take a look as someone more familiar with our serialization/modules implementation?

https://github.com/llvm/llvm-project/pull/114075