[clang] [llvm] [ThinLTO] Support dead RTTI data elimination under -fno-split-lto-unit (PR #126336)

[via llvm-commits]

luxufan wrote:

> Thanks for the work! Do you have some stats with this change applied?

Thank you for your review! I currently only have statistics for the implementation for -fsplit-lto-unit, as I have not yet evaluated -fno-split-lto-unit in our benchmark.

https://github.com/llvm/llvm-project/pull/126336