[clang] [analyzer] Disable a flaky test while triaging why its flaky (PR #127034)

[Balazs Benics via cfe-commits]

steakhal wrote:

Now it says:
```
UNSUPPORTED: Clang :: Analysis/live-stmts.cpp (1 of 1)                                                                                                                                    
Test does not support the following features and/or targets: true, true                                                                                                                   
********************                                                                                                                                                                      
                                                                                                                                                                                          
Testing Time: 0.01s                                                                                                                                                                       
                                                                                                                                                                                          
Total Discovered Tests: 1                                                                                                                                                                 
  Unsupported: 1 (100.00%)
```

https://github.com/llvm/llvm-project/pull/127034