message: [lit, windows] Disable stop-hook-threads on Windows
  This test is also no longer reliably failing or passing on Windows and it is hanging every few runs.
diff: # RUN: %lldb -b -s %p/Inputs/stop-hook-threads-2.lldbinit -s %s -f %t \
  # RUN: | FileCheck --check-prefix=CHECK --check-prefix=CHECK-FILTER %s
  # XFAIL: system-netbsd
  -# XFAIL: system-windows
  +# UNSUPPORTED: system-windows
  +# This test is flakey and hangs on windows periodically: llvm.org/pr38373
  # UNSUPPORTED: system-linux
  thread list
  