Rollup merge of #104046 - RalfJung:run-miri-run, r=oli-obk

bootstrap: add support for running Miri on a file

This enables:
```
./x.py run src/tools/miri --stage 0 --args src/tools/miri/tests/pass/hello.rs
```
That can be super helpful for debugging.

Also avoid sharing the Miri sysroot dir with a system-wide (rustup-managed) installation of Miri.

Fixes https://github.com/rust-lang/rust/issues/76666
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Michael Goulet 2022-11-09 21:53:35 -08:00 committed by GitHub
commit 32a5df82a4
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