[clang] [Utils] add update-verify-tests.py (PR #97369)

[Rahul Joshi via cfe-commits]

jurahul wrote:

Looks like these tests are failing in CI: see https://buildkite.com/llvm-project/github-pull-requests/builds/100644#0191ec9f-441f-4299-ad47-a9318fbae7a8


https://github.com/llvm/llvm-project/pull/97369