[llvm] [C API] Fix LLVMGetOrdering/LLVMIsAtomicSingleThread for fence/memory instrs (PR #65228)

[Benji Smith via llvm-commits]

Benjins wrote:

>From the build logs:
```
mt.exe : general error c101008d: Failed to write the updated manifest to the resource of file "unittests\Testing\Support\TestingSupportTests.exe". Operation did not complete successfully because the file contains a virus or potentially unwanted software.
```
Possibly Windows Defender triggering on it?

https://github.com/llvm/llvm-project/pull/65228