[llvm] Use object directly instead of accessing ArrayRef (PR #83263)

[Martin Wehking via llvm-commits]

MartinWehking wrote:

It probably expects an assert over the array size, but that would be of course superfluous.
This change is so minor that it could also be simply discarded if it's too irrelevant.

https://github.com/llvm/llvm-project/pull/83263