[llvm] [NFC][offload] Resolve warning about pessimized copy ellision. (PR #152146)

[Maksim Sabianin via llvm-commits]

maksimsab wrote:

Failed job of #131347 could be found here: https://lab.llvm.org/buildbot/#/builders/51/builds/21030

https://github.com/llvm/llvm-project/pull/152146