[clang] [Clang] [-Wunsafe-buffer-usage] Rename variable to upper camel case. (PR #176286)

[Rohan Jacob-Rao via cfe-commits]

rohanjr wrote:

@mxms0 to review if possible (I'm not able to add reviewers directly in the Github UI yet)

https://github.com/llvm/llvm-project/pull/176286