[lld] [lld][COFF][LTO] Implement /lldemit:llvm option (PR #66964)

[Greg Rodgers via llvm-commits]

gregrodgers wrote:

Yes, the above cmake fix corrected my build fail.  I look forward to your merge of the above cmake fix.  Thank you.  

https://github.com/llvm/llvm-project/pull/66964