[llvm] [OMPIRBuilder] Fix use of uninitialized variable. (PR #145883)

[Michael Klemm via llvm-commits]

https://github.com/mjklemm approved this pull request.

LGTM, asking for a hash was more a nit (in the light that other places do the same)

https://github.com/llvm/llvm-project/pull/145883