On my first Rust project, I spent more time than I care to admit
figuring out how to efficiently get an array from a slice. Update the
array documentation to explain this a bit more clearly.

(As a side note, it's a bit unfortunate that get-array-from-slice is
only available via trait since that means it can't be used from const
functions yet.)

…lows

stdarch updated their version of `cfg-if` so we need to update the one
used by libstd as well.

This commit removes an allow-list for the dynamic linking of the LLVM
tools and instead relies on the builder's linking preference only.

This reduces the amount of CSS, and makes these two pages more consistent
(which, necessarily, means changing them a bit).

This CL modifies the handing of env vars during the bootstrap process in
two ways:
1. Replaces '-' characters with '_' characters in target names to
   increase compatibility with different shells
2. Passes Stage0 snapshot compiler related env vars to early invocations
   of Cargo

…mulacrum

array docs - advertise how to get array from slice

On my first Rust project, I spent more time than I care to admit figuring out how to efficiently get an array from a slice. Update the array documentation to explain this a bit more clearly.

(As a side note, it's a bit unfortunate that get-array-from-slice is only available via trait since that means it can't be used from const functions yet.)

…r=jyn514

Extend list of targets that support dyanmic linking for llvm tools

This commit adds `linux-musl` to the list of targets that support dynamic linking for the LLVM tools.

Improve handing of env vars during bootstrap process

This CL modifies the handing of env vars during the bootstrap process in two ways:
1. Replaces '-' characters with '_' characters in target names to increase compatibility with different shells
2. Passes Stage0 snapshot compiler related env vars to early invocations of Cargo

…ebank

add note for `layout_of` when query depth overflows

Fixes rust-lang#101747
Added `try_find_layout_root` function to add a note for `layout_of` when query depth overflows. This would make the error in rust-lang#101747 look like this:
```
error: queries overflow the depth limit!
   |
note: Query depth increased by 66 when computing layout of `core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<core::option::Option<alloc::boxed::Box<alloc::string::String>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`!
  --> D:\rust-backup\parallel_rust\query_depth.rs:40:1
   |
40 | fn main() {
   | ^^^^^^^^^

error: aborting due to previous error
```

cc ``@semicoleon``

…cs-intra-doc-links, r=Mark-Simulacrum

rustdoc: add test cases for turning ``[Vec<T>]`` into ``[`Vec<T>`]``

Update stdarch

This pulls in the following changes:

- [Use simd_bitmask intrinsic in a couple of places](rust-lang/stdarch@9f09287)
- [Remove simd_shuffle<n> usage in favor of simd_shuffle](rust-lang/stdarch@3fd17e4)
- [Remove late specifiers in __cpuid_count](rust-lang/stdarch@f1db941)
  - Helps with rust-lang#101346
- [Use mov and xchg instead of movl(q) and xchgl(q)](rust-lang/stdarch@3049a31)
- [Bump cfg-if dependency to 1.0](rust-lang/stdarch@f305cc8)
- [Fix documentation of __m256bh and __m512bh structs](rust-lang/stdarch@699c093)

r? ``@Amanieu``

…v, r=jyn514

Allow building `rust-analyzer-proc-macro-srv` as a standalone tool

This PR allows building `rust-analyzer-proc-macro-srv` as a standalone tool via `x b proc-macro-srv-cli` (I thought that `x b rust-analyzer-proc-macro-srv` should work, but it doesn't for some reason...). Also this PR adds a copy of `rust-analyzer-proc-macro-srv` binary to `build/{triple}/{stage}/libexec/` when building `rust-analyzer-proc-macro-srv`, so that r-a can pick it up.

This is useful to make r-a (and I assume Intellij IDEA) to expand macros when using a custom, build from source toolchain.

r? ``@jyn514``
[_zulip thread_](https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Frust-analyzer/topic/How.20to.20fix.20.60UnsupportedABI.60.20for.20custom.20toolchains.3F/near/299040175)

…meGomez

rustdoc: clean up CSS for All Items and All Crates lists

This reduces the amount of CSS, and makes these two pages more consistent (which, necessarily, means changing them a bit).

# Before

![image](https://user-images.githubusercontent.com/1593513/190735035-c66b2664-3783-483c-9bc6-89f80e4a5490.png)

![image](https://user-images.githubusercontent.com/1593513/190735134-1d5df81d-58c5-4c86-b066-6dd3031ffc2e.png)

# After

![image](https://user-images.githubusercontent.com/1593513/190735261-fc3878bb-0cab-4c4e-a6da-b5f7abd06588.png)

![image](https://user-images.githubusercontent.com/1593513/190735389-935a7836-f2c0-4349-a7d0-7fe5378f6b9a.png)

…, r=notriddle

Continue migration of CSS themes

Now that rust-lang#101898 has been merged, we can move forward.

This PR moves more CSS theme rules as CSS variables. I also added a GUI test to prevent regressions.

Part of rust-lang#98460.

r? ``@notriddle``