[llvm] [LTO][Pipelines][Coro] Handle coroutines in LTO pipeline (PR #126168)

[Vitaly Buka via llvm-commits]

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+; RUN: llvm-as %s -o %t1.bc
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vitalybuka wrote:

We compile some objects during LTO indexing through this function.
Didn't touch that code for a while but it looks like `lto_unit` stuff for CFI

https://github.com/llvm/llvm-project/pull/126168