[MERGE #4671 @obastemur] lldb-out: improve testing with lldb debugger attached
[MERGE #4671 @obastemur] lldb-out: improve testing with lldb debugger attached

Merge pull request #4671 from obastemur:easier_flaky_detect

Trying to get the stack trace for a flaky test. Having the output corrupted for each test run is making things a lot complicated

Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore