cargo-miri: write the Xargo project files atomically
`@matthiaskrgr` this should fix https://github.com/rust-lang/miri/issues/2340. Any chance you could test this before we land it?
add support for new RMW orders
Implements support for https://github.com/rust-lang/rust/pull/98383.
Also restructure intrinsic shims a bit so we have atomic and SIMD intrinsics in their own file, and refactor atomic intrinsic name parsing.
isatty tweaks
`@saethlin` I realized we need to gate this behind the isolation flag, sorry. :/ The point of isolated mode is that it is 100% deterministic, so we cannot call host functions that might give different answers on different runs.
Improve isatty support
Per https://github.com/rust-lang/miri/issues/2292#issuecomment-1171858283, this is an attempt at
> do something more clever with Miri's `isatty` shim
Since Unix -> Unix is very simple, I'm starting with a patch that just does that. Happy to augment/rewrite this based on feedback.
The linked file in libtest specifically only supports stdout. If we're doing this to support terminal applications, I think it would be strange to support one but not all 3 of the standard streams.
The `atty` crate contains a bunch of extra logic that libtest does not contain, in order to support MSYS terminals: db8d55f88e so I think if we're going to do Windows support, we should probably access all that logic somehow. I think it's pretty clear that the implementation is not going to change, so I think if we want to, pasting the contents of the `atty` crate into Miri is on the table, instead of taking a dependency.
use PlaceTy visitor and dedup sime retagging code
I benchmarked this and as far as I can see the difference to the old code is totally within noise. And this makes the code a lot simpler and removes duplication so yay. :)
Make "./miri {build,run,test}" use debug assertions but "./miri install" not
This makes `./miri run`/`./miri test` use the full set of debug assertions (including the rather expensive ones that check consistency of the Stacked Borrows cache), but `./miri install` installs a Miri *without* those debug assertions.
That's the same behavior as cargo, and helps catch Miri bugs with the test suite while making installed Miri usable for larger runs.
