[lld] [llvm] [LTO][lld] Emit textual assembly code with '--save-temps' (PR #195922)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> An alternative approach
would be to emit textual assembly, then create an MC object to turn that
into an object file. I thought this was overkill and likely slower
overall.

Shouldn't introduce cloneModule into this. That does not guarantee identical output 

https://github.com/llvm/llvm-project/pull/195922