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

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whisperity 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 [55f3df8](https://github.com/llvm/llvm-project/commit/55f3df875d3a266c566f593357e2290879f49321) made it constantly failing.

The commit you linked belongs to a backend code change in LLVM, not this patch. Also, "unsupported platform" should show up as unsupported in LIT, not as failures. Are you using some custom `LLVM_LIT_ARGS`? If so, could you please share?

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