[compiler-rt] [llvm] A copy of https://github.com/llvm/llvm-project/pull/66825. Actually this is a superset (a copy plus the thinlto-import change) (PR #80761)

[Mingming Liu via llvm-commits]

https://github.com/minglotus-6 edited https://github.com/llvm/llvm-project/pull/80761