[clang] [clang][analyzer] fix false positive of BlockInCriticalSectionChecker (PR #126752)

[Gábor Horváth via cfe-commits]

Xazax-hun wrote:

Could you summarize the problem and the fix in the PR description? This will help people a lot when they read the git log.

https://github.com/llvm/llvm-project/pull/126752