…hecked_raw in allocation.rs; add pub fn get_alloc_bytes_unchecked_raw[_mut] in memory.rs

We are still at Python 3.8 in Fuchsia infra. This was introduced at
Python 3.10.

…manieu

Add `f16` inline ASM support for RISC-V

This PR adds `f16` inline ASM support for RISC-V. A `FIXME` is left for `f128` support as LLVM does not support the required `Q` (Quad-Precision Floating-Point) extension yet.

Relevant issue: rust-lang#125398
Tracking issue: rust-lang#116909

`@rustbot` label +F-f16_and_f128

… r=jieyouxu

Migrate `relocation-model`, `error-writing-dependencies` and `crate-name-priority` `run-make` tests to rmake

Part of rust-lang#121876 and the associated [Google Summer of Code project](https://blog.rust-lang.org/2024/05/01/gsoc-2024-selected-projects.html).

Needs MSVC try-job due to rust-lang#28026, almost guaranteed to fail, but let's see anyways.

try-job: aarch64-gnu
`/* try-job: x86_64-msvc */`
try-job: x86_64-apple-1
try-job: armhf-gnu
try-job: test-various

Add method to get `FnAbi` of function pointer

Provide a StableMIR API to query `FnAbi` of a function pointer.

Fixes [rust-lang/project-stable-mir#63](rust-lang/project-stable-mir#63)

Add direct accessors for memory addresses in `Machine` (for Miri)

The purpose of this PR is to enable direct (immutable) access to memory addresses in `Machine`, which will be needed for further extension of Miri.

This is done by adding (/completing missings pairs of) accessor functions, with the relevant signatures as follows:
```rust
/* rust/compiler/rustc_middle/src/mir/interpret/allocation.rs */

pub trait AllocBytes {
  // ..

  fn as_ptr(&self) -> *const u8;
/*fn as_mut_ptr(&mut self) -> *mut u8; -- Already in the compiler*/
}

impl<Prov: Provenance, Extra, Bytes: AllocBytes> Allocation<Prov, Extra, Bytes> {
  // ..

  pub fn get_bytes_unchecked_raw(&self) -> *const u8;
/*pub fn get_bytes_unchecked_raw_mut(&mut self) -> *mut u8; -- Already in the compiler*/
}
```
```rust
/* rust/compiler/rustc_const_eval/src/interpret/memory.rs */

impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
  // ..

  pub fn get_alloc_bytes_unchecked_raw(&self, id: AllocId) -> InterpResult<'tcx, *const u8>;
  pub fn get_alloc_bytes_unchecked_raw_mut(&mut self, id: AllocId) -> InterpResult<'tcx, *mut u8>;
}
```

r? ``@RalfJung``

[fuchsia-test-runner] Remove usage of kw_only

We are still at Python 3.8 in Fuchsia infra. This was introduced at Python 3.10.

r? tmandry
r? erickt

Remove stray `.` from error message

Add a tidy rule to check that fluent messages and attrs don't end in `.`

This adds a new dependency on `fluent-parse` to `tidy` -- we already rely on it in rustc so I feel like it's not that big of a deal.

This PR also adjusts many error messages that currently end in `.`; not all of them since I added an `ALLOWLIST`, excluded `rustc_codegen_*` ftl files, and `.teach_note` attributes.

r? ``@estebank`` ``@oli-obk``