Kazu Hirata e2a885537f Revert "[clang] Remove intrusive reference count from DiagnosticOptions (#139584)"
This reverts commit 9e306ad4600c4d3392c194a8be88919ee758425c.

Multiple builtbot failures have been reported:
https://github.com/llvm/llvm-project/pull/139584
2025-05-22 12:44:20 -07:00
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