message: Fix TestMultithreaded when specifying an alternative debugserver.
  Summary:
  This test launches a helper that uses the debugserver. The environment
  variable sepcifying the debug server wasn't passed to this helper, thus
  it was using the default one.
  Subscribers: lldb-commits
diff: @@ -101,6 +101,8 @@ class SBBreakpointCallbackCase(TestBase):
  exe = [test_exe, self.getBuildArtifact(self.inferior)]
  env = {self.dylibPath: self.getLLDBLibraryEnvVal()}
  + if os.environ['LLDB_DEBUGSERVER_PATH']:
  + env['LLDB_DEBUGSERVER_PATH'] = os.environ['LLDB_DEBUGSERVER_PATH']
  if self.TraceOn():
  print("Running test %s" % " ".join(exe))
  check_call(exe, env=env)
  