[llvm] [LTO] Avoid assert fail on failed pass plugin load (PR #96691)

[Joel E. Denny via llvm-commits]

jdenny-ornl wrote:

> LLVM Buildbot has detected a new failure on builder `llvm-clang-aarch64-darwin` running on `doug-worker-4` while building `llvm` at step 6 "test-build-unified-tree-check-all".
> 
> Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/744

> �[1m�[0m�[0;1;30m            1: �[0m�[1m�[0;1;46mllvm-lto2: LTO::run failed: No available targets are compatible with triple "x86_64-unknown-linux-gnu" �[0m

I pushed [a commit](https://github.com/llvm/llvm-project/commit/a89a54190ced6f7ded24eb3b6e5115dbe69eada8) to hopefully fix that and other bot fails.

https://github.com/llvm/llvm-project/pull/96691