[llvm] [Coro] Amortize debug info processing cost in CoroSplit (PR #109032)

[Adrian Prantl via llvm-commits]

https://github.com/adrian-prantl commented:

@felipepiovezan Can you apply this patch to the LLVM in swiftlang and run the tests with it as a sanity check?

https://github.com/llvm/llvm-project/pull/109032