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

[Balazs Benics via cfe-commits]

steakhal 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 e823f14eab4762bdf8483d02e2684f24ec4f100b

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