[clang] [Clang] Use `-targets=host-x86_64-unknown-linux-gnu` as bundler target (PR #122627)

[Shilei Tian via cfe-commits]

shiltian wrote:

### Merge activity

* **Jan 12, 10:49 AM EST**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/122627).


https://github.com/llvm/llvm-project/pull/122627