[llvm] Triple: Add BridgeOS to isOSDarwin (PR #145636)

[Matt Arsenault via llvm-commits]

arsenm wrote:

### Merge activity

* **Jun 25, 11:01 AM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/145636).


https://github.com/llvm/llvm-project/pull/145636