[clang] [clang][analysis] Fix flaky clang/test/Analysis/live-stmts.cpp test (PR #126913)

[Mikhail Goncharov via cfe-commits]

metaflow wrote:

> > For what it worth this change made it persistently failing in my setup.
> 
> I'm not sure I follow you. The test is disabled on all platforms unconditionally on main. Since #127034

yea, I know it was disabled. I meant that this very 55f3df875d3a266c566f593357e2290879f49321 made it constantly failing.

https://github.com/llvm/llvm-project/pull/126913