Following on PR rust-lang#126502, add `rustc -Zdump-mir-exclude-alloc-bytes`
to tests/mir-opt/dataflow-const-prop/aggregate_copy.rs as well
to skip writing allocation bytes in MIR dumps.

Fixes rust-lang#126261

This is an accidental omission of mine from rust-lang#126967 which means that
`rustup target add wasm32-wasip2` isn't working on today's nightlies.

…obust for rmake.rs setup

…se site

…ps}` calculations

…tions and env vars

…ced stage0

…paths` handling

…ng the scroll

…rs passed to recipes

This is important for other tests that have various things like modes,
revisions and the like. These features are not supported in run-make
tests, so we don't need the double layering.

[`macro_metavar_expr_concat`] Allow `concat` in repetitions

cc rust-lang#127723

Windows: move BSD socket shims to netc

On Windows we need to alter a few types so that they can be used in the cross-platform socket code. Currently these alterations are spread throughout the `c` module with some more in the `netc` module.

Let's gather all our BSD compatibility shims in the `netc` module so it's all in one place and easier to discover.

…rk-Simulacrum

Ignore allocation bytes in one more mir-opt test

Following on PR rust-lang#126502, add `rustc -Zdump-mir-exclude-alloc-bytes` to tests/mir-opt/dataflow-const-prop/aggregate_copy.rs as well to skip writing allocation bytes in MIR dumps.

Fixes rust-lang#126261

…k-Simulacrum

Fix git safe-directory path for docker images

This fixes the path for configuring the git safe.directory setting inside docker images. AFAIK, `~/gitconfig` without a dot is not something that git uses ([ref](https://git-scm.com/docs/git-config)). This was needed in my environment to avoid the ` fatal: detected dubious ownership in repository at '/checkout'` error. For context, this was added in rust-lang#99967.

…dist-manifest, r=Mark-Simulacrum

Add `wasm32-wasip2` to `build-manifest` tool

This is an accidental omission of mine from rust-lang#126967 which means that `rustup target add wasm32-wasip2` isn't working on today's nightlies.

…, r=Kobzol

Cleanup rmake.rs setup in compiletest

While debugging rmake.rs tests I realized that the rmake.rs setup itself in compiletest is very messy and confused. Now that I know some of the bootstrap steps and the rmake.rs tests themselves better, I realized there are cleanups that are possible:

- Rework how `source_root` and `build_root` are calculated. They should now be less fragile then before.
- Shuffle around path calculations to make them more logically grouped and closer to eventual use site(s).
- Cleanup executable extension calculation with `std::env::consts::EXE_EXTENSION`.
- Cleanup various dylib search path handling: renamed variables to better reflect their purpose, minimized mutability scope of said variables.
- Prune useless env vars passed to both `rustc` and recipe binary commands.
- Vastly improve the documentation for the setup of rmake.rs tests, including assumed bootstrap-provided build layouts, rmake.rs test layout, dylib search paths, intended purpose of passed env vars and the `COMPILETEST_FORCE_STAGE0=1 ./x test run-make --stage 0` stage0 sysroot special handling.

This PR is best reviewed commit-by-commit.

Fixes rust-lang#127920.

r? bootstrap (or Kobzol, or Mark, or T-compiler)

try-job: aarch64-apple
try-job: armhf-gnu
try-job: dist-x86_64-linux
try-job: test-various
try-job: x86_64-mingw
try-job: x86_64-msvc
try-job: x86_64-gnu-llvm-18

…splay, r=notriddle

Fix trait bounds display

Fixes rust-lang#127398.

I took a simple rule: if there are more than two bounds, we display them like rustfmt.

Before this PR:

![Screenshot from 2024-07-19 17-38-59](https://github.com/user-attachments/assets/4162b57e-7ebb-48f9-a3a1-25e443c140cb)

After this PR:

![Screenshot from 2024-07-19 17-39-09](https://github.com/user-attachments/assets/a3ba22dd-5f34-45d0-ad9d-0cdf89dc509c)

r? `@notriddle`

Remove _tls_used hack

All the MSVC targets use `target_thread_locals` (see the [base spec](https://github.com/rust-lang/rust/blob/1afc5fd042f7583b9668dd62be98325487483d1c/compiler/rustc_target/src/spec/base/windows_msvc.rs#L34)) so this hack is no longer needed. The compiler will ensure that thread locals work properly.