`failed to run LLVM passes: unknown pass name 'sancov'`

```
$ cargo rustc --bin test -- -C passes='sancov' -C llvm-args='-sanitizer-coverage-level=3' -C llvm-args='-sanitizer-coverage-inline-8bit-counters' -Z sanitizer=address
error: failed to run LLVM passes: unknown pass name 'sancov'
$ rustc --version
rustc 1.72.0-nightly (d59363ad0 2023-06-01)
```