[clang] [clang][CodeGen] Omit pre-opt link when post-opt is link requested (PR #85672)

[Jacob Lambert via cfe-commits]

lamb-j wrote:

> @lamb-j I appreciate your carrying out these performance tests!
> 
> Would you be open to providing an option to enable post-link optimization that could be off by default for now?

Currently if a user doesn't supply the new "-link-builtin-bitcodes-postopt" option, linking builtin bitcodes happens first, then the optimization pipeline follows. Does that cover the case you're talking about?

https://github.com/llvm/llvm-project/pull/85672