message: [swift/ClangImporter] build() doesn't take a `clean` argument anymore.
diff: @@ -45,7 +45,7 @@ class TestSwiftRewriteClangPaths(TestBase):
  return lst[0]
  def dotest(self, remap):
  - self.build(clean=True)
  + self.build()
  log = self.getBuildArtifact("types.log")
  self.runCmd('log enable lldb types -f "%s"' % log)
  