[llvm] [RemoveDIs] Load into new debug info format by default in LLVM (PR #89799)

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

lld is actually not involved here, this is with distributed ThinLTO that invokes clang, and this occurs in the post-link optimization pipeline. I sprinkled some `verifyModule`s around and it seems like [function importing](https://github.com/llvm/llvm-project/blob/8a3277acbc7b7af917f570f7d6430dda41c4d9ee/llvm/lib/LTO/LTOBackend.cpp#L665) is causing the issue. still investigating...

https://github.com/llvm/llvm-project/pull/89799