message: [NFC] Track swift::ASTContext allocation changes
  See Swift pull request
diff: @@ -2814,7 +2814,7 @@ private:
  swift::ASTContext *SwiftASTContext::GetASTContext() {
  if (m_ast_context_ap.get() == NULL) {
  m_ast_context_ap.reset(
  - new swift::ASTContext(GetLanguageOptions(), GetSearchPathOptions(),
  + swift::ASTContext::get(GetLanguageOptions(), GetSearchPathOptions(),
  GetSourceManager(), GetDiagnosticEngine()));
  m_diagnostic_consumer_ap.reset(new StoringDiagnosticConsumer(*this));
  