Auto merge of #2646 - saethlin:data-race-spans, r=RalfJung

Data race spans

Fixes https://github.com/rust-lang/miri/issues/2205

This adds output to data race errors very similar to the spans we emit for Stacked Borrows errors. For example, from our test suite:
```
help: The Atomic Load on thread `<unnamed>` is here
  --> tests/fail/data_race/atomic_read_na_write_race1.rs:23:13
   |
23 | ...   (&*c.0).load(Ordering::SeqCst) //~ ERROR: Data race detected between Atomic Load on thread `<unnamed>` and Write o...
   |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: The Write on thread `<unnamed>` is here
  --> tests/fail/data_race/atomic_read_na_write_race1.rs:19:13
   |
19 |             *(c.0 as *mut usize) = 32;
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^```
```

Because of https://github.com/rust-lang/miri/pull/2647 this comes without a perf regression, according to our benchmarks.

0 files changed, 0 insertions, 0 deletions