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

[Michael Klemm via llvm-commits]

https://github.com/mjklemm commented:

LGTM, but may consider not using a fixed value but compute one using a hash function like in https://github.com/llvm/llvm-project/pull/131646.

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