[llvm] [ObjCopy] Respect requirements of LC_ENCRYPTION_INFO commands (PR #120995)

[via llvm-commits]

dianqk wrote:

> @dianqk if I understand #141494 correctly, it only introduces a size regression for binaries with large amounts of load commands. Are you seeing regressions in other cases? Reverting these two will make `llvm-objcopy` and friends deal with all encryptable binaries incorrectly otherwise, which seems like a worse outcome.
> 
> (I still have to go back to the concerns from the last comment of #141494)

Here is the regression: https://github.com/rust-lang/rust/issues/141913#issuecomment-2943618549. I'm uncertain about the severity of the problem. 

https://github.com/llvm/llvm-project/pull/120995