[lldb][Windows] Report a process exit once the process is gone (#228115)
When a debugged process exits, lldb and lldb-server report the exit
while Windows is still tearing the process down. Its executable and DLLs
are still loaded at that point, so a test that deletes or replaces one
of them right after the exit fails with `"access denied"`. This is what
makes `TestReplaceDLL` fail on Windows CI.
This patch reports the exit only after the debugger has released the
exit event and the process has fully terminated, which matches how POSIX
reports an exit.
On a Windows 11 host, `TestReplaceDLL` fails to delete `foo.dll` in 246
out of 640 runs before the change and in 0 of 1,600 after.
rdar://188918066
llvm-project
f6025b00 - [lldb][Windows] Report a process exit once the process is gone (#228115)
