message: [dotest] Disable color while testing.
  Disable colors so we don't risk having unexpected ANSI codes in the test
  output. Currently, the behavior of a test can change depending on
  whether it's run under a color-supporting terminal, or under a dummy
  terminal, for example when using lit or multiprocessing.
diff: @@ -1869,6 +1869,9 @@ class TestBase(Base):
  # differ in the debug info, which is not being hashed.
  self.runCmd('settings set symbols.enable-external-lookup false')
  + # Disable color.
  + self.runCmd("settings set use-color false")
  +
  # Make sure that a sanitizer LLDB's environment doesn't get passed on.
  if 'DYLD_LIBRARY_PATH' in os.environ:
  self.runCmd('settings set target.env-vars DYLD_LIBRARY_PATH=')
  