[llvm] [ORC] Add LoadRelocatableObject: universal binary support, clearer er… (PR #104406)

[LLVM Continuous Integration via llvm-commits]

llvm-ci 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/3830

Here is the relevant piece of the build log for the reference:
```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM :: ExecutionEngine/JITLink/Generic/MachO_universal_binaries.test' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 1: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llc -filetype=obj -mtriple x86_64-apple-macosx -o /Users/buildbot/buildbot-root/aarch64-darwin/build/test/ExecutionEngine/JITLink/Generic/Output/MachO_universal_binaries.test.tmp.x86-64.o    /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/ExecutionEngine/JITLink/Generic/Inputs/main-ret-0.ll
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llc -filetype=obj -mtriple x86_64-apple-macosx -o /Users/buildbot/buildbot-root/aarch64-darwin/build/test/ExecutionEngine/JITLink/Generic/Output/MachO_universal_binaries.test.tmp.x86-64.o /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/ExecutionEngine/JITLink/Generic/Inputs/main-ret-0.ll
/Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llc: error: unable to get target for 'x86_64-apple-macosx', see --version and --triple.
--

********************


```

https://github.com/llvm/llvm-project/pull/104406