[lldb-dap] Don't error out when the process is in eStateUnloaded (llvm#138601)

DAP::WaitForProcessToStop treats the process in eStateUnloaded as an
error. The process is in this state when it has just been created
(before an attach or launch) or when it's restarted. Neither should be
treated as errors.

The current implementation can trigger this error (and a corresponding
test failure) when we call WaitForProcessToStop after attaching in
asynchronous mode (for example when using ConnectRemote which is always
asynchronous (due to a bug).

Author: JDevlieghere

lldb/tools/lldb-dap/DAP.cpp

@@ -968,6 +968,7 @@ lldb::SBError DAP::WaitForProcessToStop(std::chrono::seconds seconds) {
   while (std::chrono::steady_clock::now() < timeout_time) {
     const auto state = process.GetState();
     switch (state) {
+    case lldb::eStateUnloaded:
     case lldb::eStateAttaching:
     case lldb::eStateConnected:
     case lldb::eStateInvalid:
@@ -982,9 +983,6 @@ lldb::SBError DAP::WaitForProcessToStop(std::chrono::seconds seconds) {
     case lldb::eStateExited:
       error.SetErrorString("process exited during launch or attach");
       return error;
-    case lldb::eStateUnloaded:
-      error.SetErrorString("process unloaded during launch or attach");
-      return error;
     case lldb::eStateCrashed:
     case lldb::eStateStopped:
       return lldb::SBError(); // Success!