[llvm] Mark variable as maybe unused (only used in debug mode) (PR #157875)

[Kazu Hirata via llvm-commits]

kazutakahirata wrote:

> ⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️

@basioli-k I've fixed the formatting issue with 752c1cf8056c3ca1e326cfc7692f2e32e5917374.  Thanks!


https://github.com/llvm/llvm-project/pull/157875