[clang] [alpha.webkit.UncountedLocalVarsChecker] Don't warning on inlined functions (PR #90733)

[Balazs Benics via cfe-commits]

steakhal wrote:

In the LLVM project we expect functional changes to include tests demonstrating the motivational example, and to also serve as a regression test for the future.

https://github.com/llvm/llvm-project/pull/90733