Signed-off-by: onur-ozkan <work@onurozkan.dev>

…roalbini

handle the targets that are missing in stage0

During sanity checks, we search for target names to determine if they exist in the compiler's built-in target list (`rustc --print target-list`). While a target name may be present in the stage2 compiler, it might not yet be included in stage0. This PR handles that difference.

Follow-up of rust-lang#123546

…Jung

Generalize `adjust_from_tcx` for `Allocation`

Previously, `adjust_from_tcx` would take an `Allocation` and "adjust allocation from the ones in `tcx` to a custom Machine instance [...]".
This PR generalizes this so the Machine instance can also determine the `Bytes` type of the output `Allocation`.

r? `@RalfJung`

Use `ObligationCtxt` in favor of `TraitEngine` in many more places

r? lcnr

Add support for inputing via stdin with run-make-support

This PR adds the facility to set a input bytes that will be passed via the standard input.

This is useful for testing `rustc -` (and soon `rustdoc -`).

In rust-lang#124611 took the approach of having a dedicated `run` method but it is not very convenient to use and would necessitate many functions, one for success, one for fail, ...

Instead this PR takes a different approach and allows setting the input bytes as if it were a parameter and when calling the (now custom) `output` function, we write the input bytes into stdin. I think this gives us maximum flexibility in the implementation and a simple interface for users.

To test this new logic I ported `tests/run-make/stdin-non-utf8/` to an `rmake.rs` one.

r? `@jieyouxu`

…r-ozkan

Allow fmt to run on rmake.rs test files

As discussed with `@jieyouxu,` `rmake.rs` from the `run-make` testsuite would benefit from being formatted as well.

Only thing needed to be done for it to work: allow support for `!` in our `rustfmt.toml` file parsing.

r? `@onur-ozkan`

Fix HorizonOS build broken by rust-lang#124210

HorizonOS (for the Tier-3 target `armv6k-nintendo-3ds`) does not support `dirfd()`, as many other similar targets.