[lld] [llvm] [lld][COFF] Restore `lto-embed-bitcode` and `-fembed-bitcode` Bitcode Embedding Features (PR #188398)

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

If @HaohaiWen is ok with doing this (and looking into adding an option for this afterwards), then I guess we can go ahead and merge this (after a couple of CI checks run complete).

https://github.com/llvm/llvm-project/pull/188398