The actual fields in `config.toml.example` have dashes, not underscores.

This code was added to avoid UB in LLVM 6 and earlier, but we no longer support those LLVM versions.
Since https://reviews.llvm.org/D47807 (released in LLVM 7), uitofp does exactly what we need.

Closes rust-lang#51872

Toolstate publication only runs if the channel is "nightly" and
previously the toolstate builders did not know that the channel was
nightly (since they are not dist builders).

A look through bootstrap seems to indicate that nothing should directly
depend on the channel being set to `-dev` on the test builders, though
this may cause some problems with UI tests (if for some reason they're
dumping the channel into stderr), but we cannot find evidence of such so
hopefully this is fine.

Co-Authored-By: Mark Rousskov <mark.simulacrum@gmail.com>

Co-Authored-By: Mark Rousskov <mark.simulacrum@gmail.com>

In total it's about 100 lines of code and has received less than 5 commits in 2019 -- a good starting point.

…, r=alexcrichton"

This reverts commit 3ed3b8b, reversing
changes made to 99b8953.

We will reland a similar patch at a future date but for now we should get a nightly
released in a few hours with the parallel patch, so this should be
reverted to make sure that the next nightly is not parallel-enabled.

…Mark-Simulacrum

Enable incremental rustfmt adoption

Enables an incremental rollout of rustfmt usage within the compiler via a granular ignore configuration and automated enforcement. The decision to format the repository was approved in rust-lang/compiler-team#80 (comment).

This PR includes:

* an `[ignore]` section to `rustfmt.toml` including most of the repository
* `./x.py` downloads rustfmt from a specific nightly (we do not pin to beta or stable as we need unstable features)
* an `./x.py fmt [--check]` command which runs cargo-fmt
* `./x.py fmt --check` runs during the same test step as `src/tools/tidy`, on master, but not on beta or stable as we don't want to depend on nightly rustfmt there.
* a commit to format `src/librustc_fs_util` as an initial target and to ensure enforcement is working from the start

Fix the configure.py TOML field for a couple LLVM options

The actual fields in `config.toml.example` have dashes, not underscores.

make htons const fn

This may partially help rust-lang#67315.

…atthewjasper

Remove now-redundant range check on u128 -> f32 casts

This code was added to avoid UB in LLVM 6 and earlier, but we no longer support those LLVM versions.
Since https://reviews.llvm.org/D47807 (released in LLVM 7), uitofp does exactly what we need.

Closes rust-lang#51872

…ietroalbini

Set release channel on non-dist builders

Toolstate publication only runs if the channel is "nightly" and
previously the toolstate builders did not know that the channel was
nightly (since they are not dist builders).

A look through bootstrap seems to indicate that nothing should directly
depend on the channel being set to `-dev` on the test builders, though
this may cause some problems with UI tests (if for some reason they're
dumping the channel into stderr), but we cannot find evidence of such so
hopefully this is fine.

r? @pietroalbini

…t, r=Mark-Simulacrum

Revert enabling parallelism by default

We will re-land a similar patch at a future date but for now we should get a nightly
released in a few hours with the parallel patch, so this should be
reverted to make sure that the next nightly is not parallel-enabled.

r? @ghost